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Menopause is having a moment. How a new generation of women are shaping cultural attitudes

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/bridgette-glover-2232638">Bridgette Glover</a>, <a href="https://theconversation.com/institutions/university-of-new-england-919">University of New England</a></em></p> <p>From hot flashes to hysteria, <a href="https://rowman.com/ISBN/9780739170007/Periods-in-Pop-Culture-Menstruation-in-Film-and-Television">film and TV</a> have long represented menopause as scary, emotional and messy.</p> <p>Recently, celebrities have been sharing their personal menopause experiences on social media, helping to re-frame the conversation in popular culture.</p> <p>We are also seeing more stories about menopause on television, with real stories and depictions that show greater empathy for the person going through it.</p> <p>Menopause is having a moment. But will it help women?</p> <h2>The change onscreen</h2> <p>This is not what we’re used to seeing on our screens. Countless sitcoms, from All in the Family (1971–79) to Two and a Half Men (2003–15) have used the menopause madness trope for laughs.</p> <p>Retro sitcom That ‘70s Show (1998–2006) used mom Kitty’s menopause journey as comedic fodder for multiple episodes. When she mistakes a missed period for pregnancy, Kitty’s surprise menopause diagnosis results in an identity crisis alongside mood swings, hot flashes and irritability.</p> <p>But the audience is not meant to empathise. Instead, the focus is on how Kitty’s menopause impacts the men in her family. Having to navigate Kitty’s symptoms, her veteran husband likens the experience to war: “I haven’t been this frosty since Korea”.</p> <figure><iframe src="https://www.youtube.com/embed/mPLJBZiKV4U?wmode=transparent&amp;start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe></figure> <p>Even when male characters are not directly involved, women are determined to reject menopause because they see it as a marker of age that signals a loss of desirability and social worth. In Sex and the City (1998–2004), Samantha describes herself as “day-old bread” when she presumes her late period signifies menopause.</p> <p>This is a popular framing of menopause in <a href="https://www.tandfonline.com/doi/full/10.1080/14680777.2018.1409969">post-feminist TV</a> of the 1990s and early 2000s. While the <a href="https://www.tandfonline.com/doi/full/10.1080/14680777.2012.712373#d1e783">menstruating body</a> is constructed as uncontrollable and in need of management, the menopausal body requires management and maintenance to reject signals of collapse.</p> <p>These storylines erase the genuine experiences of confusion, discomfort and transformation that come with menopause.</p> <h2>A cultural moment arrives</h2> <p><a href="https://www.npr.org/sections/health-shots/2015/12/31/460726461/why-2015-was-the-year-of-the-period-and-we-dont-mean-punctuation">Since 2015</a>, stories of menstruation have increased in popular culture.</p> <p>Series like comedy Broad City (2014–19) and comedy-drama Better Things (2016–22) directly call out the lack of menopause representations. When Abbi in Broad City admits she “totally forgot about menopause”, a woman responds “Menopause isn’t represented in mainstream media. Like, no one wants to talk about it”.</p> <p>Similarly, in Better Things, while watching her three daughters stare at the TV Sam laments: “No one wants to hear about it, which is why nobody ever prepared you for it”.</p> <p>And lack of preparation becomes a key theme for perimenopausal Charlotte in the Sex and the City reboot, And Just Like That … (2021–) when she has a “flash period”.</p> <figure><iframe src="https://www.youtube.com/embed/9AmwXuHo-2w?wmode=transparent&amp;start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe></figure> <p>Fleabag (2016–19) included a groundbreaking monologue about menopause delivered by Kristen Scott-Thomas, playing a successful businesswoman. She describes menopause as “horrendous, but then it’s magnificent”.</p> <blockquote> <p>[…] your entire pelvic floor crumbles, and you get fucking hot, and no one cares. But then you’re free. No longer a slave. No longer a machine with parts.</p> </blockquote> <figure><iframe src="https://www.youtube.com/embed/RZrnHnASRV8?wmode=transparent&amp;start=13" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe></figure> <p>Scripted by Phoebe Waller-Bridge, this <a href="https://www.latimes.com/entertainment/la-et-menopause-20190524-story.html">celebrated</a> monologue critiques the post-feminist notion of striving to be the “<a href="https://www.tandfonline.com/doi/full/10.1080/14680777.2012.712373#d1e783">idealised feminine body</a>”. Through this new feminist lens, menopause is acknowledged as both painful – physically and emotionally – and necessary for liberation.</p> <h2>Today’s menopause on screen</h2> <p>Alongside more recent series like The Change (2023), multiple documentaries including <a href="https://www.tamsenfadal.com/the-m-factor">The (M) Factor</a> (2024), and <a href="https://theconversation.com/there-is-no-future-for-ageing-women-how-the-substance-uses-body-horror-in-a-feminist-critique-239729">arguably</a> even films like The Substance (2024), social media has become a prolific space for raising awareness about menopause.</p> <p>Celebrities use social media to share tales of perimenopause and menopause, often in real time.</p> <p>Last year, actor Drew Barrymore experienced her “first perimenopausal hot flash” during her talk show.</p> <p>And ABC News Breakfast guest host, Imogen Crump, had to pause her news segment, saying</p> <blockquote> <p>I could keep stumbling through, but I’m having such a perimenopausal hot flush right now, live on air.</p> </blockquote> <p>Both Barrymore and Crump shared clips of their live segments to their social media pages, to challenge stigma and create conversations. Crump even posted to <a href="https://www.linkedin.com/posts/imogen-crump-6b74b726_perimenopause-activity-7127788484861300736-mhHh/">LinkedIn</a> to raise awareness in a professional setting.</p> <p>In a podcast interview clip shared to Instagram, writer and skincare founder, Zoë Foster Blake describes perimenopause as a “real mental health thing”, because of the lack of awareness. Recalling conversations with other perimenopausal women, Foster Blake says “We all think we’re crazy. We don’t know what the fuck is going on”.</p> <p>Feeling “crazy” is a constant theme in these conversations. As actor and <a href="https://stripesbeauty.com/pages/founder-story">menopause awareness advocate</a> Naomi Watts points out, this is largely thanks to Hollywood. Despite the stigmatising media stereotype of “crazy lady that shouts”, <a href="https://www.youtube.com/watch?v=TQ3BN9rS_7g">Watts argues</a> that with “support and community”, women experiencing perimenopause and menopause “can thrive”.</p> <p>In fact, Watts believes menopause should be celebrated: “we know ourselves better, we’re wiser for our cumulative experiences”.</p> <p>Medical professionals like American doctors <a href="https://www.instagram.com/p/DBUCPW5OUTf/">Marie Clare Haver</a> and <a href="https://www.instagram.com/p/C7IfaHDgXMY/">Corinne Menn</a> have been well-positioned to share their expertise and experiences via social media. They are catching and helping fuel a wave of advocacy and awareness for midlife women’s health.</p> <h2>Building community</h2> <p>After watching the menopause madness trope on our screens for decades, we are now seeing perimenopause and menopause depicted with more empathy. These depictions allow viewers – those who menstruate, who have menstruated, and who know menstruators – to feel seen and be informed.</p> <p>By sharing their experiences on social media and adding to these new screen stories, celebrities are building a community that makes the menopausal journey less lonely and helps those on it remember their worth.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241784/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/bridgette-glover-2232638">Bridgette Glover</a>, PhD Candidate in Media and Communications, <a href="https://theconversation.com/institutions/university-of-new-england-919">University of New England</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/menopause-is-having-a-moment-how-a-new-generation-of-women-are-shaping-cultural-attitudes-241784">original article</a>.</em></p> </div>

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Hospice nurse shares what happens to the body after death

<p dir="ltr">A hospice nurse has revealed the reality of what happens to our bodies in the minutes, hours and days after we die. </p> <p dir="ltr">In her efforts to break down the taboo around conversations about death, Julie McFadden, a hospice nurse from the US, posts candid videos about death and dying to help us be more informed and prepared. </p> <p dir="ltr">In Julie’s latest video, she explains exactly what happens to the human body in the moments, hours and days after someone dies. </p> <p dir="ltr">Nurse Julie said that in the immediate moments after death, the body completely relaxes, beginning the first stage of decomposition, called hypostasis.</p> <p dir="ltr">“All of the things in your body that are holding fluids in, relaxes. That's why death can be messy sometimes.”</p> <p dir="ltr">She clarified that because of how relaxed the body becomes, those who have just died may urinate, have bowel movements or experience bodily fluids coming out of their nose, mouth, ears or eyes. </p> <p dir="ltr">Nurse Julie added, “I like to talk about it so people aren't surprised if that happens - very normal and to be expected sometimes.”</p> <p dir="ltr">This is also when the stage of decomposition called autolysis, or “the self-digestion” stage, occurs and enzymes begin to break down oxygen-deprived tissue, also causing the body temperature to drop. </p> <p dir="ltr">As the body settles in the hours after death, Nurse Julie said the blood will begin to pool downward toward the ground.</p> <p dir="ltr">She said, “If you let someone lie there for long enough - which we do sometimes; you don't have to hurry up and make sure your loved one leaves the house - if you turn them you will notice usually the back of their legs the whole backside of them will look purple or darker that's because all their blood is pulling down.”</p> <p dir="ltr">“Gravity is pulling it down. So they will eventually get a darker colour tone of skin on their backside.”</p> <p dir="ltr">One to two hours after death is also when rigor mortis - or the stiffening of a body’s muscles - sets in and continues for about the next 24 hours</p> <p dir="ltr">Nurse Julie said, “I have seen people become very stiff almost immediately - like a few minutes - after death and other people, their body takes longer.”</p> <p dir="ltr">Additionally, about 12 hours after death, the body will feel cool to the touch. </p> <p dir="ltr">About a day to a day and a half after a person dies, rigor mortis subsides and the body will begin to loosen again, as Nurse Julie said the body's tissues relax and cause the stiffness to break down.</p> <p dir="ltr">By this time, the body is usually in the mortuary, which will prepare the body in whichever way the family has requested, whether it is for burial or cremation. </p> <p dir="ltr">She added, “In a world where people didn't have access to a mortuary or a healthcare system and they just died naturally, our bodies are built to, after death, decompose.”</p> <p dir="ltr"><em>Image credits: Shutterstock / Instagram / YouTube</em></p>

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Fasting, eating earlier in the day or eating fewer meals – what works best for weight loss?

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/hayley-oneill-1458016">Hayley O'Neill</a>, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> and <a href="https://theconversation.com/profiles/loai-albarqouni-452476">Loai Albarqouni</a>, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a></em></p> <p>Globally, <a href="https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight">one in eight people</a> are living with obesity. This is an issue because <a href="https://www.aihw.gov.au/reports/risk-factors/risk-factors-to-health/contents/overweight-and-obesity">excess fat</a> <a href="https://pubmed.ncbi.nlm.nih.gov/27423262/">increases the risk</a> of type 2 diabetes, heart disease and certain cancers.</p> <p><a href="https://pubmed.ncbi.nlm.nih.gov/33393504/">Modifying your diet</a> is important for managing obesity and preventing weight gain. This might include reducing your calorie intake, changing your <a href="https://pubmed.ncbi.nlm.nih.gov/39143663/">eating patterns</a> and prioritising healthy food.</p> <p>But is one formula for weight loss more likely to result in success than another? Our <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11530941/">new research</a> compared three weight-loss methods, to see if one delivered more weight loss than the others:</p> <ul> <li>altering calorie distribution – eating more calories earlier rather than later in the day</li> <li>eating fewer meals</li> <li>intermittent fasting.</li> </ul> <p>We analysed data from 29 clinical trials involving almost 2,500 people.</p> <p>We found that over 12 weeks or more, the three methods resulted in similar weight loss: 1.4–1.8kg.</p> <p>So if you do want to lose weight, choose a method that works best for you and your lifestyle.</p> <h2>Eating earlier in the day</h2> <p>When our metabolism <a href="https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/metabolic-syndrome">isn’t functioning properly</a>, our body can’t respond to the hormone insulin properly. This can lead to weight gain, fatigue and can increase the risk of a number of chronic diseases such as diabetes.</p> <p>Eating later in the day – with a <a href="https://pubmed.ncbi.nlm.nih.gov/23512957/">heavy dinner</a> and late-night snacking – seems to lead to <a href="https://pubmed.ncbi.nlm.nih.gov/33172509/">worse metabolic function</a>. This means the body becomes less efficient at converting food into energy, managing blood sugar and regulating fat storage.</p> <p>In contrast, consuming calories <a href="https://pubmed.ncbi.nlm.nih.gov/31151228/">earlier</a> in the day appears to <a href="https://pubmed.ncbi.nlm.nih.gov/29754952/">improve</a> metabolic function.</p> <p>However, this might not be the case for everyone. Some people naturally have an evening “chronotype”, meaning they wake up and stay up later.</p> <p>People with this chronotype appear to have <a href="https://pubmed.ncbi.nlm.nih.gov/36803075/">less success losing weight</a>, no matter the method. This is due to a combination of factors including genes, an increased likelihood to have a poorer diet overall and higher levels of hunger hormones.</p> <h2>Eating fewer meals</h2> <p><a href="https://pubmed.ncbi.nlm.nih.gov/30700403/">Skipping breakfast</a> is common, but does it hinder weight loss? Or is a <a href="https://pubmed.ncbi.nlm.nih.gov/28967343/">larger breakfast and smaller dinner</a> ideal?</p> <p>While <a href="https://pubmed.ncbi.nlm.nih.gov/28137935/">frequent meals</a> may reduce disease risk, recent studies suggest that compared to eating one to two meals a day, eating six times a day might increase <a href="https://pubmed.ncbi.nlm.nih.gov/32437566/">weight loss success</a>.</p> <p>However, this doesn’t reflect the broader research, which tends to show consuming <a href="https://pubmed.ncbi.nlm.nih.gov/33485709/">fewer meals</a> can lead to greater weight loss. <a href="https://pubmed.ncbi.nlm.nih.gov/39485353/">Our research</a> suggests three meals a day is better than six. The easiest way to do this is by cutting out snacks and keeping breakfast, lunch and dinner.</p> <p>Most studies compare three versus six meals, with limited evidence on whether <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7490164/">two meals is better than three</a>.</p> <p>However, <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11530941/">front-loading your calories</a> (consuming most of your calories between breakfast and lunch) appears to be better for weight loss and may also help <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9605877/">reduce hunger</a> across the day. But more studies with a longer duration are needed.</p> <h2>Fasting, or time-restricted eating</h2> <p>Many of us eat over a period of more than <a href="https://pubmed.ncbi.nlm.nih.gov/26411343/">14 hours a day</a>.</p> <p>Eating late at night <a href="https://pubmed.ncbi.nlm.nih.gov/26411343/">can throw off</a> your body’s natural rhythm and alter how your organs function. Over time, this can increase your risk of type 2 diabetes and other chronic diseases, particularly among <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8617838/">shift workers</a>.</p> <p><a href="https://pubmed.ncbi.nlm.nih.gov/35194176/">Time-restricted eating</a>, a form of intermittent fasting, means eating all your calories within a <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7262456/">six- to ten-hour window</a> during the day when you’re most active. It’s not about changing what or how much you eat, but <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7262456/">when you eat it</a>.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7262456/">Animal studies</a> suggest time-restricted eating can lead to weight loss and improved metabolism. But the evidence in humans is still limited, especially about the long-term benefits.</p> <p>It’s also unclear if the benefits of time-restricted eating are due to the timing itself or because people are eating less overall. When we looked at studies where participants ate freely (with no intentional calorie limits) but followed an eight-hour daily eating window, they naturally consumed about 200 fewer calories per day.</p> <h2>What will work for you?</h2> <p>In the past, clinicians have thought about weight loss and avoiding weight gain as a simile equation of calories in and out. But factors such as how we distribute our calories across the day, how often we eat and whether we eat late at night may also impact our metabolism, weight and health.</p> <p>There are no easy ways to lose weight. So choose a method, or combination of methods, that suits you best. You might consider</p> <ul> <li>aiming to eat in an eight-hour window</li> <li>consuming your calories earlier, by focusing on breakfast and lunch</li> <li>opting for three meals a day, instead of six.</li> </ul> <p>The <a href="https://link.springer.com/article/10.1007/s13679-024-00555-2">average adult gains 0.4 to 0.7 kg per year</a>. Improving the quality of your diet is important to prevent this weight gain and the strategies above might also help.</p> <p>Finally, there’s still a lot we don’t know about these eating patterns. Many existing studies are short-term, with small sample sizes and varied methods, making it hard to make direct comparisons.</p> <p>More research is underway, including well-controlled trials with larger samples, diverse populations and consistent methods. So hopefully future research will help us better understand how altering our eating patterns can result in better health.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/242028/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/hayley-oneill-1458016">Hayley O'Neill</a>, Assistant Professor, Faculty of Health Sciences and Medicine, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> and <a href="https://theconversation.com/profiles/loai-albarqouni-452476">Loai Albarqouni</a>, Assistant Professor | NHMRC Emerging Leadership Fellow, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/fasting-eating-earlier-in-the-day-or-eating-fewer-meals-what-works-best-for-weight-loss-242028">original article</a>.</em></p> </div>

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Can you die from long COVID? The answer is not so simple

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/rose-shiqi-luo-1477061">Rose (Shiqi) Luo</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>; <a href="https://theconversation.com/profiles/catherine-itsiopoulos-14246">Catherine Itsiopoulos</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>; <a href="https://theconversation.com/profiles/kate-anderson-1412897">Kate Anderson</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>; <a href="https://theconversation.com/profiles/magdalena-plebanski-1063786">Magdalena Plebanski</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>, and <a href="https://theconversation.com/profiles/zhen-zheng-1321031">Zhen Zheng</a>, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a></em></p> <p>Nearly five years into the pandemic, COVID is feeling less central to our daily lives.</p> <p>But the virus, SARS-CoV-2, is still around, and for many people the effects of an infection can be long-lasting. When symptoms persist for more than three months after the initial COVID infection, this is generally referred to as <a href="https://www.who.int/europe/news-room/fact-sheets/item/post-covid-19-condition">long COVID</a>.</p> <p>In September, Grammy-winning Brazilian musician <a href="https://www.abc.net.au/news/2024-09-07/brazilian-musician-sergio-mendez-dies-at-83/104323360">Sérgio Mendes</a> died aged 83 after reportedly having long COVID.</p> <p><a href="https://www.abs.gov.au/articles/covid-19-mortality-australia-deaths-registered-until-31-july-2023">Australian data</a> show 196 deaths were due to the long-term effects of COVID from the beginning of the pandemic up to the end of July 2023.</p> <p>In the United States, the Centers for Disease Control and Prevention reported 3,544 <a href="https://www.cdc.gov/nchs/pressroom/nchs_press_releases/2022/20221214.htm">long-COVID-related deaths</a> from the start of the pandemic up to the end of June 2022.</p> <p>The symptoms of <a href="https://www.healthdirect.gov.au/long-covid">long COVID</a> – such as fatigue, shortness of breath and “brain fog” – can be debilitating. But can you die from long COVID? The answer is not so simple.</p> <h2>How could long COVID lead to death?</h2> <p>There’s still a lot we don’t understand about what causes long COVID. A popular theory is that “zombie” <a href="https://www.pnas.org/doi/full/10.1073/pnas.2300644120">virus fragments</a> may linger in the body and cause inflammation even after the virus has gone, resulting in long-term health problems. Recent research suggests a reservoir of <a href="https://www.sciencedirect.com/science/article/abs/pii/S1198743X24004324?via%3Dihub">SARS-CoV-2 proteins</a> in the blood might explain why some people experience ongoing symptoms.</p> <p>We know a serious COVID infection can damage <a href="https://covid19.nih.gov/news-and-stories/long-term-effects-sars-cov-2-organs-and-energy#:%7E:text=What%20you%20need%20to%20know,main%20source%20of%20this%20damage">multiple organs</a>. For example, severe COVID can lead to <a href="https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-long-haulers-long-term-effects-of-covid19">permanent lung dysfunction</a>, persistent heart inflammation, neurological damage and long-term kidney disease.</p> <p>These issues can in some cases lead to death, either immediately or months or years down the track. But is death beyond the acute phase of infection from one of these causes the direct result of COVID, long COVID, or something else? Whether long COVID can <em>directly</em> cause death continues to be a topic of debate.</p> <p>Of the <a href="https://www.cdc.gov/nchs/data/vsrr/vsrr025.pdf">3,544 deaths</a> related to long COVID in the US up to June 2022, the most commonly recorded underlying cause was COVID itself (67.5%). This could mean they died as a result of one of the long-term effects of a COVID infection, such as those mentioned above.</p> <p>COVID infection was followed by heart disease (8.6%), cancer (2.9%), Alzheimer’s disease (2.7%), lung disease (2.5%), diabetes (2%) and stroke (1.8%). Adults aged 75–84 had the highest rate of death related to long COVID (28.8%).</p> <p>These findings suggest many of these people died “with” long COVID, rather than from the condition. In other words, long COVID may not be a direct driver of death, but rather a contributor, likely exacerbating existing conditions.</p> <h2>‘Cause of death’ is difficult to define</h2> <p>Long COVID is a relatively recent phenomenon, so mortality data for people with this condition are limited.</p> <p>However, we can draw some insights from the experiences of people with post-viral conditions that have been studied for longer, such as myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS).</p> <p>Like long COVID, <a href="https://bmjopen.bmj.com/content/12/5/e058128">ME/CFS</a> is a complex condition which can have significant and varied effects on a person’s physical fitness, nutritional status, social engagement, mental health and quality of life.</p> <p>Some research indicates people with ME/CFS are at <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5218818/">increased risk</a> of dying from causes including heart conditions, infections and suicide, that may be triggered or compounded by the debilitating nature of the syndrome.</p> <p>So what is the emerging data on long COVID telling us about the potential increased risk of death?</p> <p>Research from 2023 has suggested adults in the US with long COVID were at <a href="https://jamanetwork.com/journals/jama-health-forum/fullarticle/2802095">greater risk</a> of developing heart disease, stroke, lung disease and asthma.</p> <p>Research has also found <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9721155/">long COVID</a> is associated with a higher risk of <a href="https://www.tandfonline.com/doi/full/10.1080/21642850.2022.2164498#abstract">suicidal ideation</a> (thinking about or planning suicide). This may reflect common symptoms and consequences of long COVID such as sleep problems, fatigue, chronic pain and emotional distress.</p> <p>But long COVID is more likely to occur in people who have <a href="https://www.aihw.gov.au/reports/covid-19/long-covid-in-australia-a-review-of-the-literature/summary">existing health conditions</a>. This makes it challenging to accurately determine how much long COVID contributes to a person’s death.</p> <p>Research has long revealed <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7302107/">reliability issues</a> in cause-of-death reporting, particularly for people with chronic illness.</p> <h2>So what can we conclude?</h2> <p>Ultimately, long COVID is a <a href="https://www.health.gov.au/topics/chronic-conditions/about-chronic-conditions">chronic condition</a> that can significantly affect quality of life, mental wellbeing and overall health.</p> <p>While long COVID is not usually immediately or directly life-threatening, it’s possible it could exacerbate existing conditions, and play a role in a person’s death in this way.</p> <p>Importantly, many people with long COVID around the world lack access to appropriate support. We need to develop <a href="https://www.mja.com.au/journal/2024/221/9/persistent-symptoms-after-covid-19-australian-stratified-random-health-survey">models of care</a> for the optimal management of people with long COVID with a focus on multidisciplinary care.</p> <p><em>Dr Natalie Jovanovski, Vice Chancellor’s Senior Research Fellow in the School of Health and Biomedical Sciences at RMIT University, contributed to this article.</em><!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/239184/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/rose-shiqi-luo-1477061"><em>Rose (Shiqi) Luo</em></a><em>, Postdoctoral Research Fellow, School of Health and Biomedical Sciences, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>; <a href="https://theconversation.com/profiles/catherine-itsiopoulos-14246">Catherine Itsiopoulos</a>, Professor and Dean, School of Health and Biomedical Sciences, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>; <a href="https://theconversation.com/profiles/kate-anderson-1412897">Kate Anderson</a>, Vice Chancellor's Senior Research Fellow, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>; <a href="https://theconversation.com/profiles/magdalena-plebanski-1063786">Magdalena Plebanski</a>, Professor of Immunology, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a>, and <a href="https://theconversation.com/profiles/zhen-zheng-1321031">Zhen Zheng</a>, Associate Professor, STEM | Health and Biomedical Sciences, <a href="https://theconversation.com/institutions/rmit-university-1063">RMIT University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/can-you-die-from-long-covid-the-answer-is-not-so-simple-239184">original article</a>.</em></p> </div>

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Don’t like drinking plain water? 10 healthy ideas for staying hydrated this summer

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/emily-burch-438717">Emily Burch</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p>Have you heard the saying “water is life?” Well, it’s true.</p> <p>Water is an <a href="https://www.hsph.harvard.edu/nutritionsource/water/">essential nutrient</a>. Our body cannot produce sufficient water to live, so we need to consume water through food and fluids to survive.</p> <p>Maintaining hydration is one of the most fundamental components of good health. But lots of people don’t like drinking plain water much. The good news is there are many other healthy ways to help you stay hydrated.</p> <h2>Why hydration is important</h2> <p>Water is vital for many aspects of body functioning. About half our blood is “blood plasma”, which is over 90% water. Blood plasma is essential for carrying energy, nutrients and oxygen to the cells in the body that need it most. Water helps to remove waste products via the kidneys. It also helps keep joints lubricated, the digestive system functioning, the body’s temperature controlled and skin plump and strong.</p> <p>If you don’t consume enough water, you may experience symptoms of dehydration such as headaches, dizziness, tiredness, low concentration, constipation and a dry mouth. Being severely dehydrated increases the risk of <a href="https://www.kidney.org/atoz/content/kidneystones">kidney stones</a> and <a href="https://www.healthdirect.gov.au/urinary-tract-infection-uti">urinary tract infections</a>.</p> <p>If you feel thirsty, it means your body is already <a href="https://my.clevelandclinic.org/health/treatments/9013-dehydration#:%7E:text=If%20you're%20thirsty%2C%20you,life%2Dthreatening%20illnesses%20like%20heatstroke.">mildly dehydrated</a>, so make sure you pay attention to what your body is telling you.</p> <h2>How much fluid do you need?</h2> <p>The amount of fluid we need changes as we age. Relative to our body weight, our needs decrease. So, a newborn baby has higher fluid needs (per kilogram body weight) than their parent, and older adults have lower fluid needs than younger adults.</p> <p>Fluid requirements are related to metabolic needs and vary from person-to-person. The normal turnover of water in adults is approximately 4% of total body weight per day. So, for example, if you weigh 70 kilograms, you’ll lose about 2.5 to 3 litres of water a day (not including sweating). This means you will need to consume that amount of water from food and drinks to maintain your hydration.</p> <p>Eight cups (or two litres) a day is often <a href="https://www.npr.org/2022/09/21/1124371309/busting-common-hydration-water-myths?utm_source=npr_newsletter&amp;utm_medium=email&amp;utm_content=20221016&amp;utm_term=7386723&amp;utm_campaign=health&amp;utm_id=31926817&amp;orgid=&amp;utm_att1=">mentioned</a> as the amount of water we should aim for and a nice way to track your intake. But it doesn’t account for individual variation based on age, gender, body size and activity levels.</p> <p>Alcohol is a diuretic, which means it dehydrates the body by promoting water loss through urine. This fluid loss is a key factor that contributes to the severity of a hangover. Always have a glass of water in between alcoholic drinks to help stay hydrated.</p> <p>Caffeinated drinks (like tea and coffee) only have a mild diuretic effect. For most healthy adults, it’s okay to consume up to 400 mg of caffeine a day – that’s about four cups of coffee or eight cups of tea. If you drink more than this, it may impact your hydration levels.</p> <p>To check your specific requirements, check out the Australian <a href="https://www.nrv.gov.au/nutrients/water">guidelines</a> for fluid intake.</p> <h2>People who should take extra care</h2> <p>Some people are at greater risk of the harmful health effects from dehydration and need to pay special attention to their fluid intake.</p> <p>The highest priority groups are babies, young kids, pregnant women, and older adults. These groups are at greater risk for many reasons, including relatively higher water needs per kilo of body weight, reduced ability to detect and respond to symptoms of dehydration, and barriers to consuming fluids regularly.</p> <p>Family and friends can play an important role in <a href="https://www.agedcareguide.com.au/information/hydration-for-elderly-people-and-the-dangers-of-dehydration">supporting loved ones</a> to maintain hydration, especially during warm weather.</p> <h2><strong>Ten ideas for keeping fluids up this summer</strong></h2> <ol> <li> <p><strong>Download a water reminder app on your phone</strong> This will help keep you on track during the day and give you digital “high fives” when you hit your water goals.</p> </li> <li> <p><strong>Add sugar-free flavouring</strong> Try a sugar-free fruit infusion in your water to make it more appealing. Prepare a jug in the refrigerator and infuse it overnight so it’s chilled for you the next day. Fill it up and take it everywhere with you!</p> </li> <li> <p><strong>Add some fresh fruit</strong> Add some slices of lime, lemon, berries, pineapple or orange to your water bottle for some natural flavouring. If the bottle is kept in a fridge, the fruit will stay fresh for about three days.</p> </li> <li> <p><strong>Make a jug of iced tea (not the bottled stuff)</strong> There are many great sugar-free recipes online. Tea contributes to fluid intake too. For green and black teas, brew in boiling water then cool overnight on the bench before refrigerating. Fruit teas can be made using cold water immediately.</p> </li> <li> <p><strong>Add a dash of cordial to your water</strong> A small amount of cordial in your water is a healthier alternative to drinking a sugar-sweetened soft drink or fruit juice. Diet cordials have less added sugar again.</p> </li> <li> <p><strong>Make a fruit ‘slushie’</strong> Combine fresh fruit, ice and water at home in the morning and sip to increase your fluid intake for the day.</p> </li> <li> <p><strong>Buy a soda maker for your home</strong> Some people find plain water tastes better with bubbles. Sparkling mineral water is great too, as long as there is no added sugar or sweeteners.</p> </li> <li> <p><strong>Before you eat anything, have a glass of water</strong> Make it a rule with yourself to have a glass of water before every snack or meal.</p> </li> <li> <p><strong>Eat water-rich fruits and vegetables</strong> Many fruits and vegetables have a high water content. Some of the best include berries, oranges, grapes, carrots, lettuce, cabbage, spinach and melons. Keep a container full of cut-up fruit to snack on in your fridge.</p> </li> <li> <p><strong>Use a water bottle</strong> Take it with you during the day and keep it by your bed overnight.</p> </li> </ol> <h2>A tip on water bottles</h2> <p>Water bottles are everywhere and sometimes seem to offer <a href="https://www.refinery29.com/en-au/emotional-support-water-bottle-girlies-tiktok-trend">emotional support</a> as well as hydration.</p> <p>Having a water bottle you enjoy using can go a long way in helping you keep up your fluids during the day.</p> <p>Pay attention to the material of the water bottle and use one that helps you form good habits. Some people prefer metal water bottles as they can keep water cooler for longer (others feel like they are camping). Some prefer glass bottles because the water isn’t affected by any flavours from the container (others fear breaking the glass).</p> <p>Consider the practical aspects, too: Will it fit in your bag? Will it be light enough to carry with you? Can you “chug” on it when you’re exceptionally thirsty? Does the lid require screwing? How durable is it in preventing leaks? Do some <a href="https://www.marthastewart.com/7842071/best-water-bottles-hydration">homework</a> on your water bottle, an essential accessory!<!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, Professor of Community Health and Wellbeing, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/emily-burch-438717">Emily Burch</a>, Dietitian and Researcher, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/dont-like-drinking-plain-water-10-healthy-ideas-for-staying-hydrated-this-summer-191859">original article</a>.</em></p> </div>

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Humans evolved to share beds – how your sleeping companions may affect you now

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/goffredina-spano-2240566">Goffredina Spanò</a>, <a href="https://theconversation.com/institutions/kingston-university-949">Kingston University</a> and <a href="https://theconversation.com/profiles/gina-mason-2240569">Gina Mason</a>, <a href="https://theconversation.com/institutions/brown-university-1276">Brown University</a></em></p> <p><a href="https://www.cell.com/trends/ecology-evolution/fulltext/S0169-5347(24)00176-9">Recent research</a> on animal sleep behaviour has revealed that sleep is influenced by the animals around them. Olive baboons, for instance, sleep less as group sizes increase, while mice can synchronise their rapid eye movement (REM) cycles.</p> <p>In western society, many people expect to sleep alone, if not with a romantic partner. But as with other group-living animals, human co-sleeping is common, despite some <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945710000377">cultural</a> and <a href="https://www.sciencedirect.com/science/article/abs/pii/S2352721820303053?via%3Dihub">age-related variation</a>. And in many cultures, bedsharing with a relative is considered typical.</p> <p>Apart from <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945710000377">western countries</a>, caregiver-infant co-sleeping is common, with rates as high as <a href="https://www.sciencedirect.com/science/article/abs/pii/S1087079216000265">60-100%</a> in parts of South America, Asia and Africa.</p> <p>Despite its prevalence, infant co-sleeping is controversial. Some western perspectives, that value self-reliance, argue that sleeping alone promotes self-soothing when the baby wakes in the night. But <a href="https://www.tandfonline.com/doi/abs/10.1080/00221325.2021.1905599">evolutionary scientists argue</a> that co-sleeping has been important to help keep infants warm and safe throughout human existence.</p> <p><a href="https://www.sleephealthjournal.org/article/S2352-7218(22)00077-8/abstract">Many cultures</a> do not expect babies to self-soothe when they wake in the night and see night wakings as a normal part of breastfeeding <a href="https://www.sciencedirect.com/science/article/pii/S1389945713002220?via%3Dihub">and development</a>.</p> <p>Concerns about Sudden Infant Death Syndrome (Sids) have often led paediatricians to discourage bed-sharing. However, when studies control for <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0107799">other Sids risk factors</a> including unsafe sleeping surfaces, Sids risk does not seem to differ statistically between co-sleeping and solitary sleeping infants.</p> <p>This may be one reason why agencies such as the <a href="https://publications.aap.org/pediatrics/article/150/1/e2022057990/188304/Sleep-Related-Infant-Deaths-Updated-2022?autologincheck=redirected">American Academy of Pediatrics</a>, the <a href="https://www.nice.org.uk/guidance/qs37/chapter/Quality-statement-5-Safer-practices-for-bed-sharing">National Institute for Health and Care Excellence</a> and the <a href="https://www.nhs.uk/conditions/baby/caring-for-a-newborn/reduce-the-risk-of-sudden-infant-death-syndrome/">NHS</a> either <a href="https://publications.aap.org/pediatrics/article/150/1/e2022057990/188304/Sleep-Related-Infant-Deaths-Updated-2022">recommend that</a> infants “sleep in the parents’ room, close to the parents’ bed, but on a separate surface,” or, if bedsharing, to make sure that the infant <a href="https://www.nice.org.uk/guidance/qs37/chapter/Quality-statement-5-Safer-practices-for-bed-sharing">“sleeps on a firm, flat mattress”</a> without pillows and duvets, rather than discouraging co-sleeping altogether.</p> <p>Researchers don’t yet know whether co-sleeping causes differences in sleep or, whether co-sleeping happens because of these differences. However, experiments in the 1990s suggested that co-sleeping can <a href="https://onlinelibrary.wiley.com/doi/10.1002/ajpa.20736">encourage more sustained and frequent bouts of breastfeeding</a>. Using sensors to measure brain activity, this research also suggested that infants’ and caregivers’ sleep may be lighter during co-sleeping. But researchers speculated that this lighter sleep may actually <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1905599">help protect against Sids</a> by providing infants more opportunities to rouse from sleep and develop better control over their respiratory system.</p> <p>Other advocates believe that co-sleeping <a href="https://www.sciencedirect.com/science/article/abs/pii/S0163638319301237">benefits infants’ emotional and mental health</a> by promoting parent-child bonding and aiding infants’ <a href="https://www.tandfonline.com/doi/full/10.3109/10253890.2012.742057">stress hormone regulation</a>. However, current data is inconclusive, with most studies showing <a href="https://www.sciencedirect.com/science/article/abs/pii/S0163638319301249?via%3Dihub">mixed findings</a> or <a href="https://www.tandfonline.com/doi/full/10.1080/14616734.2024.2380427">no differences</a> between co-sleepers and solitary sleepers with respect to short and long-term mental health.</p> <h2>Co-sleeping in childhood</h2> <p>Childhood co-sleeping past infancy is also fairly common according to <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945713011076?via%3Dihub">worldwide surveys</a>. A <a href="https://publications.aap.org/pediatrics/article-abstract/126/5/e1119/65347/Relationship-Between-Bed-Sharing-and-Breastfeeding">2010 survey</a> of over 7,000 UK families found 6% of children were constant bedsharers up to at least four years old.</p> <p>Some families adopt co-sleeping <a href="https://capmh.biomedcentral.com/articles/10.1186/s13034-023-00607-w">in response to</a> their child having trouble sleeping. But child-parent bedsharing in many countries, including some western countries <a href="https://onlinelibrary.wiley.com/doi/10.1111/j.1471-6712.2005.00358.x">like Sweden</a> where children often co-sleep with parents until school age, is viewed culturally as part of a nurturing environment.</p> <p>It is also common for siblings to share a room or even a bed. A <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1916732">2021 US study</a> found that over 36% of young children aged three to five years bedshared in some form overnight, whether with caregivers, siblings, pets or some combination. Co-sleeping decreases but is still present among older children, with up to <a href="https://onlinelibrary.wiley.com/doi/10.1111/fare.12955">13.8% of co-sleeping parents</a> in Australia, the UK and other countries reporting that their child was between five and 12 years old when they engaged in co-sleeping.</p> <p>Two recent US studies using wrist-worn actigraphs (motion sensors) to track sleep indicated that kids who bedshare may have <a href="https://jcsm.aasm.org/doi/10.5664/jcsm.11352">shorter sleep durations</a> than children who sleep alone. But this shorter sleep duration <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1916732">is not explained by</a> greater disruption during sleep. Instead, bedsharing children may lose sleep by <a href="https://www.tandfonline.com/doi/full/10.1080/00221325.2021.1916732">going to bed later than</a> solitary sleepers.</p> <p>The benefits and downsides of co-sleeping may also differ in children with conditions such as <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945717303842">autism spectrum disorder</a>, <a href="https://link.springer.com/article/10.1007/s10802-017-0387-1">mental health disorders</a> and <a href="https://onlinelibrary.wiley.com/doi/10.1111/dmcn.13300">chronic illnesses</a>. These children may experience heightened anxiety, sensory sensitivities and physical discomfort that make falling and staying asleep difficult. For them, co-sleeping can provide <a href="https://link.springer.com/article/10.1007/s11325-018-1710-y">reassurance</a>.</p> <h2>Adults sharing beds</h2> <p>According to <a href="https://www.sleepfoundation.org/wp-content/uploads/2018/10/NSF_Bedroom_Poll_Report_1.pdf">a 2018 survey</a> from the US National Sleep Foundation, 80-89% of adults who live with their significant other share a bed with them. Adult bedsharing has shifted over time from pre-industrial <a href="https://academic.oup.com/ahr/article-abstract/106/2/343/64370?redirectedFrom=fulltext">communal arrangements</a>, including whole families and other household guests, to <a href="https://academic.oup.com/jdh/article-abstract/23/3/275/359439?redirectedFrom=fulltext">solo sleeping</a> in response to hygiene concerns as germ theory became accepted.</p> <p>Many couples find that bedsharing boosts their <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC1978364/">sense of closeness</a>. Research shows that bedsharing with your partner can lead to <a href="https://onlinelibrary.wiley.com/doi/10.1155/2017/8140672">longer sleep times</a> and a <a href="https://academic.oup.com/sleep/article-abstract/17/4/308/2753131">feeling of better sleep</a> overall.</p> <p>Bedsharing couples also often <a href="https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2020.00583/full">get into sync</a> with each other’s sleep stages, which can enhance that feeling of intimacy. However, it’s not all rosy. Some studies indicate that females in heterosexual relationships may struggle more with sleep quality when bedsharing, as they can be <a href="https://link.springer.com/article/10.1111/j.1479-8425.2007.00320.x">more easily disturbed</a> by their male partner’s movements. Also, bedsharers can have less <a href="https://pubmed.ncbi.nlm.nih.gov/27624285/">deep sleep</a> than when sleeping alone, even though they feel like their sleep is better together.</p> <p>Many questions about co-sleeping remain unanswered. For instance, we don’t fully understand the developmental effects of co-sleeping on children, or the benefits of co-sleeping for adults beyond female-male romantic partners. But, some work suggests that co-sleeping can <a href="https://link.springer.com/article/10.1007/s11325-018-1710-y">comfort us</a>, similar to other <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/jsr.14174">forms of social contact</a>, and help to enhance <a href="https://onlinelibrary.wiley.com/doi/10.1002/ajpa.20736">physical synchrony</a> between parents and children.</p> <p>Co-sleeping doesn’t have a one-size-fits-all answer. But remember that western norms aren’t necessarily the ones we have evolved with. So consider factors such as <a href="https://www.sciencedirect.com/science/article/abs/pii/S1389945716301265">sleep disorders</a>, health and age in your decision to co-sleep, rather than what everyone else is doing.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241803/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/goffredina-spano-2240566">Goffredina Spanò</a>, Lecturer in Developmental Cognitive Neuroscience, <a href="https://theconversation.com/institutions/kingston-university-949">Kingston University</a> and <a href="https://theconversation.com/profiles/gina-mason-2240569">Gina Mason</a>, Postdoctoral Research Fellow in Psychiatry and Human Behaviour, <a href="https://theconversation.com/institutions/brown-university-1276">Brown University</a></em></p> <p><em>Image </em><em>credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/humans-evolved-to-share-beds-how-your-sleeping-companions-may-affect-you-now-241803">original article</a>.</em></p> </div>

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Is thirst a good predictor of dehydration?

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/kiara-too-2243669">Kiara Too</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p>Water is essential for daily functioning and health, and we can only survive <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2908954/">a few days</a> without it. Yet we constantly lose water through sweat, urination and even evaporation when we breathe.</p> <p>This is why we <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5957508/">have evolved</a> a way to regulate and maintain water in our bodies. Like other animals, our survival relies on a strong biological drive that tells us to find and drink water to balance fluid loss.</p> <p>This is thirst – a sensation of dryness in the mouth signalling we need to have a drink. This <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5957508/">basic physiological mechanism</a> is controlled mainly by part of the brain’s “control centre”, called the hypothalamus. The hypothalamus <a href="https://www.ncbi.nlm.nih.gov/books/NBK535380/#:%7E:text=The%20hypothalamus%20is%20the%20region,and%20the%20control%20of%20appetite.">receives signals</a> from various regions of the body and in return, releases hormones that act as a messenger to signal the thirst sensation.</p> <h2>What is dehydration?</h2> <p>Staying hydrated (having enough water in our bodies) is important for <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2908954/">several reasons</a>, including:</p> <ul> <li>regulating body temperature through sweat and respiration</li> <li>lubricating joints and eyes</li> <li>preventing infections</li> <li>digesting and absorbing nutrients</li> <li>flushing out waste (via the kidneys)</li> <li>preventing constipation</li> <li>brain function (including memory and concentration)</li> <li>mood and energy levels</li> <li>physical performance and recovery from exercise</li> <li>skin health.</li> </ul> <p>Dehydration occurs when our body doesn’t have enough water. Even slight drops in fluid levels have <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC2908954/">noticeable consequences</a>, such as headaches, feeling dizzy, lethargy and struggling to concentrate.</p> <p><a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4874113/">Chronic dehydration</a> can pose more serious health risks, including urinary tract infections, constipation and kidney stones.</p> <h2>What does the evidence say?</h2> <p>Despite thirst being one of the most basic biological drivers for good hydration, science suggests our feelings of thirst and subsequent fluid intake don’t always correlate with hydration levels.</p> <p>For example, a <a href="https://www.mdpi.com/2072-6643/16/18/3212">recent study</a> explored the impact of thirst on fluid intake and hydration status. Participants attended a lab in the morning and then later in the afternoon to provide markers of hydration status (such as urine, blood samples and body weight). The relationship between levels of thirst in the morning and afternoon hydration status was negligible.</p> <p>Further, thirst may be driven by environmental factors, such as access to water. For example, <a href="https://www.sciencedirect.com/science/article/pii/0031938484901549">one study</a> looked at whether ample access to water in a lab influenced how much people drank and how hydrated they were. The link between how thirsty they felt and how hydrated they were was weak, suggesting the availability of water influenced their fluid intake more than thirst.</p> <p>Exercise can also <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC6893511/">change our thirst mechanism</a>, though studies are limited at this stage.</p> <p>Interestingly, research shows women experience thirst more strongly than men, regardless of hydration status. To understand <a href="https://www.sciencedirect.com/science/article/pii/S2475299123148852">gender differences in thirst</a>, researchers infused men and women with fluids and then measured their thirst and how hydrated they were. They found women generally reported thirst at a lower level of fluid loss. Women have also been found to respond more <a href="https://www.mdpi.com/2072-6643/16/18/3212">to feeling thirsty</a> by drinking more water.</p> <h2>Other ways to tell if you need to drink some water</h2> <p>While acknowledging some people will need to drink more or less, for <a href="https://theconversation.com/dont-like-drinking-plain-water-10-healthy-ideas-for-staying-hydrated-this-summer-191859">many people</a>, eight cups (or two litres) a day is a good amount of water to aim for.</p> <p>But beyond thirst, there are many other ways to tell whether you might need to drink more water.</p> <p><strong>1. urine colour:</strong> pale yellow urine typically indicates good hydration, while darker, concentrated urine suggests dehydration</p> <p><strong>2. frequency of going to the toilet:</strong> <a href="https://www.ncbi.nlm.nih.gov/books/NBK291/">urinating regularly</a> (around four to six times a day) indicates good hydration. Infrequent urination can signal dehydration</p> <p><strong>3. skin turgor test:</strong> gently <a href="https://www.healthline.com/health/skin-turgor#test">pinching the skin</a> (for example, on the back of the hand) and observing how quickly the skin returns to its normal position can help assess hydration. Slow return may indicate dehydration</p> <p><strong>4. mouth and lips:</strong> a dry mouth or cracked lips can be early signs of dehydration</p> <p><strong>5. headaches and fatigue:</strong> frequent headaches, dizziness, or unexplained fatigue can be <a href="https://www.tandfonline.com/doi/full/10.1080/07853890.2019.1628352">signs of inadequate hydration</a></p> <p><strong>6. sweating:</strong> in physically active people, monitoring how much they sweat during activity can help estimate fluid loss and hydration needs. Higher levels of sweat may predispose a person to dehydration if they are unable to replace the fluid lost through water intake</p> <p>These indicators, used together, provide a more comprehensive picture of hydration without solely depending on the sensation of thirst.</p> <p>Of course, if you do feel thirsty, it’s still a good idea to drink some water.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/242194/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, Professor of Community Health and Wellbeing, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/kiara-too-2243669">Kiara Too</a>, PhD candidate, School of Human Movement and Nutrition Sciences, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/is-thirst-a-good-predictor-of-dehydration-242194">original article</a>.</em></p> </div>

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From eye exams to blood tests and surgery: how doctors use light to diagnose disease

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/matthew-griffith-1539353">Matthew Griffith</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p>You’re not feeling well. You’ve had a pounding headache all week, dizzy spells and have vomited up your past few meals.</p> <p>You visit your GP to get some answers and sit while they shine a light in your eyes, order a blood test and request some medical imaging.</p> <p>Everything your GP just did relies on light. These are just some of the optical technologies that have had an enormous impact in how we diagnose disease.</p> <h2>1. On-the-spot tests</h2> <p>Point-of-care diagnostics allow doctors to test patients on the spot and get answers in minutes, rather than sending samples to a lab for analysis.</p> <p>The “flashlight” your GP uses to view the inside of your eye (known as an <a href="https://medlineplus.gov/ency/article/003881.htm">ophthalmoscope</a>) is a great example. This allows doctors to detect abnormal blood flow in the eye, deformations of the cornea (the outermost clear layer of the eye), or swollen optical discs (a round section at the back of the eye where the nerve link to the brain begins). Swollen discs are a sign of elevated pressure inside your head (or in the worst case, a brain tumour) that could be <a href="https://www.hopkinsmedicine.org/health/conditions-and-diseases/headache/increased-intracranial-pressure-icp-headache">causing your headaches</a>.</p> <p>The invention of <a href="https://openmedscience.com/lighting-the-way-in-healthcare-the-transformative-role-of-lasers-in-medicine/">lasers and LEDs</a> has enabled many other miniaturised technologies to be provided at the bedside or clinic rather than in the lab.</p> <p><a href="https://theconversation.com/whats-a-pulse-oximeter-should-i-buy-one-to-monitor-covid-at-home-174457">Pulse oximetry</a> is a famous example, where a clip attached to your finger reports how well your blood is oxygenated. It does this by <a href="https://www.howequipmentworks.com/pulse_oximeter/">measuring</a> the different responses of oxygenated and de-oxygenated blood to different colours of light.</p> <p>Pulse oximetry is used at hospitals (and <a href="https://theconversation.com/whats-a-pulse-oximeter-should-i-buy-one-to-monitor-covid-at-home-174457">sometimes at home</a>) to monitor your respiratory and heart health. In hospitals, it is also a valuable tool for detecting <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(12)60107-X/fulltext">heart defects in babies</a>.</p> <h2>2. Looking at molecules</h2> <p>Now, back to that blood test. Analysing a small amount of your blood can diagnose <a href="https://theconversation.com/blood-tests-and-diagnosing-illness-what-can-blood-tell-us-about-whats-happening-in-our-body-80327">many different diseases</a>.</p> <p>A machine called an automated “full blood count analyser” tests for general markers of your health. This machine directs focused beams of light through blood samples held in small glass tubes. It counts the number of blood cells, determines their specific type, and reports the level of haemoglobin (the protein in red blood cells that distributes oxygen around your body). In minutes, this machine can provide a <a href="https://www.nuffieldhealth.com/article/inside-the-pathology-lab-what-happens-to-my-blood">snapshot</a> of your overall health.</p> <p>For more specific disease markers, blood serum is separated from the heavier cells by spinning in a rotating instrument called a centrifuge. The serum is then exposed to special chemical stains and enzyme assays that change colour depending on whether specific molecules, which may be the sign of a disease, are present.</p> <p>These colour changes can’t be detected with the naked eye. However, a light beam from an instrument called a <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5476943/#R88">spectrometer</a> can detect tiny amounts of these substances in the blood and determine if the biomarkers for diseases are present, and at what levels.</p> <h2>3. Medical imaging</h2> <p>Let’s re-visit those medical images your GP ordered. The development of fibre-optic technology, made famous for transforming high-speed digital communications (such as the NBN), allows light to get inside the body. The result? High-resolution optical imaging.</p> <p>A common example is an <a href="https://www.medicalnewstoday.com/articles/153737#risks-and-side-effects">endoscope</a>, where fibres with a tiny camera on the end are inserted into the body’s natural openings (such as your mouth or anus) to examine your gut or respiratory tracts.</p> <p>Surgeons can insert the same technology through tiny cuts to view the inside of the body on a video screen during <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9553337/">laparoscopic surgery</a> (also known as keyhole surgery) to diagnose and treat disease.</p> <h2>How about the future?</h2> <p>Progress in nanotechnology and a better understanding of the interactions of light with our tissues are leading to new light-based tools to help diagnose disease. These include:</p> <ul> <li> <p><a href="https://onlinelibrary.wiley.com/doi/full/10.1002/advs.201903441">nanomaterials</a> (materials on an extremely small scale, many thousands of times smaller than the width of a human hair). These are being used in next-generation sensors and new diagnostic tests</p> </li> <li> <p><a href="https://www.nature.com/articles/s41587-019-0045-y">wearable optical biosensors</a> the size of your fingernail can be included in devices such as watches, contact lenses or finger wraps. These devices allow non-invasive measurements of sweat, tears and saliva, in real time</p> </li> <li> <p>AI tools to analyse how blood serum scatters infrared light. This has allowed researchers to build a <a href="https://www.advancedsciencenews.com/powerful-diagnostic-approach-uses-light-to-detect-virtually-all-forms-of-cancer/">comprehensive database</a> of scatter patterns to detect <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/aisy.202300006">any cancer</a></p> </li> <li> <p>a type of non-invasive imaging called <a href="https://www.ncbi.nlm.nih.gov/books/NBK554044/">optical coherence tomography</a> for more detailed imaging of the eye, heart and skin</p> </li> <li> <p>fibre optic technology to deliver a tiny microscope into the body on the <a href="https://www.uwa.edu.au/projects/microscope-in-a-needle">tip of a needle</a>.</p> </li> </ul> <p>So the next time you’re at the GP and they perform (or order) some tests, chances are that at least one of those tests depend on light to help diagnose disease.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/231379/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><a href="https://theconversation.com/profiles/matthew-griffith-1539353"><em>Matthew Griffith</em></a><em>, Associate Professor and ARC Future Fellow and Director, UniSA Microscopy and Microanalysis Facilities, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/from-eye-exams-to-blood-tests-and-surgery-how-doctors-use-light-to-diagnose-disease-231379">original article</a>.</em></p> </div>

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What are house dust mites and how do I know if I’m allergic to them?

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/deryn-lee-thompson-1449312">Deryn Lee Thompson</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p>People often believe they are allergic to <a href="https://ahd.csiro.au/everything-in-our-homes-gathers-dust-but-what-exactly-is-it-where-does-it-come-from-and-why-does-it-keep-coming-back-is-it-from-outside-is-it-fibres-from-our-clothes-and-cells-from-our-skin/">house dust</a>. But of the <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-minimisation">20% of Australians</a> suffereing with allergies, a number are are actually allergic to microscopic <a href="https://www.healthdirect.gov.au/dust-mites">house dust mites</a>.</p> <p>House dust mites belong to the same family as spiders and ticks. They measure just 0.2-0.3 mm, with 50 fitting on a single pinhead. They <a href="https://www.intechopen.com/chapters/71977">live</a> for 65–100 days, and females lay 60–100 eggs in their life.</p> <p>House dust mites love temperate climates and humidity. They feed off the skin cells we and animals shed, as well as mould, which they digest using special enzymes. These enzymes are excreted in their poo about <a href="https://www.intechopen.com/chapters/71977">20 times a day</a>. They also shed fragments of their exoskeletons.</p> <p>All these fragments trigger allergies in people with this type of allergic rhinitis (which is also known as hay fever)</p> <h2>What are the symptoms?</h2> <p>When people with house dust mite allergy inhale the allergens, they penetrate the mucous membranes of the airways and eyes. Their body recognises the allergens as a threat, releasing chemicals including one called histamine.</p> <p>This causes symptoms including a runny nose, an itchy nose, eyes and throat, sneezing, coughing and a feeling of mucus at the back of your throat (known as a post-nasal drip).</p> <p>People with this type of allergy usually mouth breath, snore, rub their nose constantly (creating a nasal crease called the “dust mite salute”) and have dark shadows under their eyes.</p> <p>House dust mite allergy <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7328274/">can also cause</a> poor sleep, constant tiredness, reduced concentration at work or school and lower quality of life.</p> <p>For people with eczema, their damaged skin barrier can allow house dust mite proteins in. This prompts immune cells in the skin to <a href="https://academic.oup.com/bjd/article/190/1/e5/7485663">release chemicals</a> which make already flared skin become redder, sorer and itchier, especially in children.</p> <p>Symptoms of house dust mite allergy occur year round, and are often worse after going to bed and when waking in the morning. But people with house dust mite allergy <em>and</em> pollen allergies find their year-round symptoms worsen in spring.</p> <h2>How is it diagnosed?</h2> <p>House dust mite allergy symptoms often build up over months, or even years before people seek help. But an accurate diagnosis means you can not only access the right treatment – it’s also vital for minimising exposure.</p> <p>Doctor and nurse practitioners can order a <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-minimisation">blood test</a> to check for house dust mite allergy.</p> <p>Alternatively, health care providers with <a href="https://www.allergy.org.au/hp/a-career-in-clinical-immunology-and-allergy">specialised allergy training</a> can perform skin prick tests. This involves placing drops of the allergens on the arm, along with a positive and negative “control”. After 15 minutes, those who test positive will have developed a mosquito bite-like mark.</p> <h2>How is it treated?</h2> <p>Medication options include one or a combination of:</p> <ul> <li>daily non-sedating antihistamines</li> <li>a steroid nasal spray</li> <li>allergy eye drops.</li> </ul> <p>Your health care professional will work with you to develop a <a href="https://www.allergy.org.au/images/stories/pospapers/ar/ASCIA_HP_Allergic_Rhinitis_2022.pdf">rhinitis (hay fever) medical management plan</a> to reduce your symptoms. If you’re using a nasal spray, your health provider will <a href="https://www.youtube.com/watch?v=_ytYj1TLojM">show you how to use it</a>, as people often use it incorrectly.</p> <p>If you also have <a href="https://www.nationalasthma.org.au/understanding-asthma/how-is-asthma-managed">asthma</a> or eczema which is worsened by dust mites, your health provider will adapt your <a href="https://www.nationalasthma.org.au/health-professionals/asthma-action-plans">asthma action plan</a> or <a href="https://medcast.com.au/qhub/eczema/resources">eczema care plan</a> accordingly.</p> <p>If you experience severe symptoms, a longer-term option is <a href="https://www.allergy.org.au/images/pc/ASCIA_PC_Allergen_Immunotherapy_FAQ_2024.pdf">immunotherapy</a>. This aims to gradually turn off your immune system’s ability to recognise house dust mites as a harmful allergen.</p> <p>Immunotherapy involves taking either a daily sublingual tablet, under the tongue, or a series of injections. Injections require monthly attendances over three years, after the initial weekly build-up phase.</p> <p>These are <a href="https://theconversation.com/im-considering-allergen-immunotherapy-for-my-hay-fever-what-do-i-need-to-know-190408">effective</a>, but are costly (as well as time-consuming). So it’s important to weigh up the potential benefits and downsides with your health-care provider.</p> <h2>How can you minimise house dust mites?</h2> <p>There are also important allergy minimisation measures you can take to reduce allergens in your home.</p> <p>Each week, <a href="https://www.allergy.org.au/component/finder/search?q=minimisation&amp;Itemid=100001">wash</a> your bedding and pyjamas in hot water (over 60°C). This <a href="https://www.nationalasthma.org.au/living-with-asthma/resources/patients-carers/factsheets/dust-mites-trigger-my-asthma">removes</a> house dust mite eggs and debris.</p> <p>Opt for doonas, covers or quilts that can be washed in hot water above 60°C. Alternatively, low-cost waterproof or leak proof covers can keep house dust mites out.</p> <p>If you can, favour blinds and wood floors over curtains and carpet. Dust blinds and surfaces with a damp cloth each week and vacuum while wearing a mask, or have someone else do it, as house dust mites can become airborne during cleaning.</p> <p>But beware of costly products with big marketing budgets and little evidence to support their use. A new mattress, for example, will always be house dust mite-free. But once slept on, the house dust mite life cycle can start.</p> <p>Mattress protectors and toppers commonly claim to be “hypoallergenic”, “anti-allergy” or “allergy free”. But their pore sizes are not small enough to keep house dust mites and their poo out, or shed skin going through.</p> <p>Sprays claiming to kill mites require so much spray to penetrate the product that it’s likely to become wet, may smell like the spray and, unless dried properly, may grow mould.</p> <p>Finally, claims that expensive vacuum cleaners can extract all the house dust mites are unsubstantiated.</p> <p><em>For more information, visit <a href="https://www.healthdirect.gov.au/dust-mites">healthdirect.gov.au</a> or the <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-minimisation">Australian Society of Clinical Immunology and Allergy</a>.</em><!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/240918/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/deryn-lee-thompson-1449312">Deryn Lee Thompson</a>, Eczema and Allergy Nurse; Lecturer, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/what-are-house-dust-mites-and-how-do-i-know-if-im-allergic-to-them-240918">original article</a>.</em></p> </div>

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How light tells you when to sleep, focus and poo

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p>Exposure to light is crucial for our physical and mental health, as this and future articles in the series will show.</p> <p>But the <em>timing</em> of that light exposure is also crucial. This tells our body to wake up in the morning, when to poo and the time of day to best focus or be alert. When we’re exposed to light also controls our body temperature, blood pressure and even chemical reactions in our body.</p> <p>But how does our body know when it’s time to do all this? And what’s light got to do with it?</p> <h2>What is the body clock, actually?</h2> <p>One of the key roles of light is to re-set our body clock, also known as the circadian clock. This works like an internal oscillator, similar to an actual clock, ticking away as you read this article.</p> <p>But rather than ticking you can hear, the body clock is a network of genes and proteins that regulate each other. This network sends signals to organs via hormones and the nervous system. These complex loops of interactions and communications have a rhythm of about 24 hours.</p> <p>In fact, we don’t have one clock, we have trillions of body clocks throughout the body. The central clock is in the hypothalamus region of the brain, and each cell in every organ has its own. These clocks work in concert to help us adapt to the daily cycle of light and dark, aligning our body’s functions with the time of day.</p> <p>However, our body clock is not precise and works to a rhythm of <em>about</em> 24 hours (24 hours 30 minutes on average). So every morning, the central clock needs to be reset, signalling the start of a new day. This is why light is so important.</p> <p>The central clock is directly connected to <a href="https://journals.sagepub.com/doi/abs/10.1177/07487304231225706">light-sensing cells</a> in our retinas (the back of the eye). This daily re-setting of the body clock with morning light is essential for ensuring our body works well, in sync with our environment.</p> <p>In parallel, <a href="https://theconversation.com/does-it-matter-what-time-of-day-i-eat-and-can-intermittent-fasting-improve-my-health-heres-what-the-science-says-203762">when we eat food</a> also plays a role in re-setting the body clock, but this time the clock in organs other than the brain, such as the liver, kidneys or the gut.</p> <p>So it’s easy to see how our daily routines are closely linked with our body clocks. And in turn, our body clocks shape how our body works at set times of the day.</p> <h2>What time of day?</h2> <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=1 600w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=2 1200w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=3 1800w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=1 754w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=2 1508w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=3 2262w" alt="" /></a><figcaption><span class="caption">Matt Garrow/The Conversation.</span> <span class="attribution"><a class="source" href="https://delos.com/blog/why-natural-light-is-important-for-mental-and-physical-health/">Adapted from Delos</a>, <a class="license" href="http://creativecommons.org/licenses/by/4.0/">CC BY</a></span></figcaption></figure> <h2>Let’s take a closer look at sleep</h2> <p>The naturally occurring brain hormone <a href="https://pubmed.ncbi.nlm.nih.gov/30311830/">melatonin</a> is linked to our central clock and makes us feel sleepy at certain times of day. When it’s light, our body stops making melatonin (its production is inhibited) and we are alert. Closer to bedtime, the hormone is made, then secreted, making us feel drowsy.</p> <p>Our sleep is also <a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00944/full">partly controlled</a> by <a href="https://www.annualreviews.org/content/journals/10.1146/annurev-genom-121222-120306">our genes</a>, which are part of our central clock. These genes influence our <a href="https://theconversation.com/does-it-matter-what-time-i-go-to-bed-198146">chronotype</a> – whether we are a “lark” (early riser), “night owl” (late sleeper) or a “dove” (somewhere in between).</p> <p>But exposure to light at night when we are supposed to be sleeping can have harmful effects. Even dim light from light pollution can impair our <a href="https://www.pnas.org/doi/10.1073/pnas.2113290119">heart rate and how we metabolise sugar</a> (glucose), may lead to <a href="https://doi.org/10.1038/s44220-023-00135-8">psychiatric disorders</a> such as depression, anxiety and bipolar disorder, and increases the overall risk of <a href="https://www.pnas.org/doi/10.1073/pnas.2405924121">premature death</a>.</p> <p>The main reason for these harmful effects is that light “at the wrong time” disturbs the body clock, and these effects are more pronounced for “night owls”.</p> <p>This “misaligned” exposure to light is also connected to the detrimental health effects we often see in people who <a href="https://theconversation.com/why-does-night-shift-increase-the-risk-of-cancer-diabetes-and-heart-disease-heres-what-we-know-so-far-190652">work night shifts</a>, such as an increased risk of cancer, diabetes and heart disease.</p> <h2>How about the gut?</h2> <p>Digestion also follows a circadian rhythm. Muscles in the colon that help move waste <a href="https://doi.org/10.1111/j.1572-0241.2004.40453.x">are more active</a> during the day and slow down at night.</p> <p>The most significant increase in colon movement starts at 6.30am. This is one of the reasons why most people feel the urge to poo <a href="https://theconversation.com/why-do-i-poo-in-the-morning-a-gut-expert-explains-229624">in the early morning</a> rather than at night.</p> <p>The gut’s day-night rhythm is a direct result of the action of the gut’s own clock and the central clock (which synchronises the gut with the rest of the body). It’s also influenced by when we eat.</p> <h2>How about focusing?</h2> <p>Our body clock also helps control our attention and alertness levels by changing how our brain functions at certain times of day. Attention and alertness levels improve in the afternoon and evening but dip during the night and early morning.</p> <p>Those fluctuations <a href="https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2012.00050/full">impact performance</a> and can lead to decreased productivity and an <a href="https://www.nature.com/articles/s41598-019-40914-x">increased risk</a> of errors and accidents during the less-alert hours.</p> <p>So it’s important to perform certain tasks that <a href="https://pubmed.ncbi.nlm.nih.gov/30923475/">require our attention</a> at certain times of day. That includes driving. In fact, disruption of the circadian clock at the start of daylight savings – when our body hasn’t had a chance to adapt to the clocks changing – <a href="https://www.sciencedirect.com/science/article/pii/S0960982219316781?via%3Dihub">increases the risk</a> of a car accident, particularly in the morning.</p> <h2>What else does our body clock control?</h2> <p>Our body clock influences many other aspects of our biology, including:</p> <ul> <li><strong>physical performance</strong> by controlling the activity of our <a href="https://doi.org/10.1038/s41574-023-00805-8">muscles</a></li> <li><strong>blood pressure</strong> by controlling the <a href="https://theconversation.com/what-time-of-day-should-i-take-my-medicine-125809">system of hormones</a> involved in regulating our blood volume and blood vessels</li> <li><strong>body temperature</strong> by controlling our metabolism and our level of physical activity</li> <li><strong>how our body handles drugs and toxins</strong> by <a href="https://doi.org/10.1080/17460441.2023.2224554">controlling enzymes</a> involved in how the liver and kidneys eliminate these substances from the body.</li> </ul> <h2>Morning light is important</h2> <p>But what does this all mean for us? Exposure to light, especially in the morning, is crucial for synchronising our circadian clock and bodily functions.</p> <p>As well as setting us up for a good night’s sleep, increased morning light exposure benefits our <a href="https://www.sciencedirect.com/science/article/pii/S0165032721008612?via%3Dihub">mental health</a> and <a href="https://academic.oup.com/jcem/article/101/9/3539/2806883">reduces the risk of obesity</a>. So boosting our exposure to morning light – for example, by going for a walk, or having breakfast outside – can directly benefit our mental and metabolic health.</p> <p>However, there are other aspects about which we have less control, including <a href="https://www.sciencedirect.com/science/article/pii/S0168952524001100">the genes</a> that control our body clock.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/236780/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, Associate Professor, Physiology of Circadian Rhythms, Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, NHMRC Emerging Leadership Fellow Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-light-tells-you-when-to-sleep-focus-and-poo-236780">original article</a>.</em></p> </div>

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Nearly 200 chemicals linked to cancer found in everyday food packaging

<p>A new study has uncovered the alarming amount of potential carcinogens in food packaging and plastic tableware. </p> <p>Researchers from the Food Packaging Forum found that nearly 200 chemicals linked to breast cancer are being used in food packaging, with dozens of these carcinogens able to find their way into the body. </p> <p>“There is strong evidence that 76 known or potential breast carcinogens from food contact materials recently purchased all over the world can be found in people,” study co-author Jane Muncke said.</p> <p>“Getting rid of these known or suspected carcinogens in our food supply is a huge opportunity for cancer prevention.”</p> <p>Muncke is managing director and chief scientific officer at the Food Packaging Forum, a non-profit foundation based in Zurich, Switzerland focusing on science communication and research. </p> <p>The study, published last month in the journal Frontiers In Toxicology, compared a list of potential breast carcinogens to a list of chemicals that have been found in food contact materials to find out which of the potential carcinogens could be getting into people's diets. </p> <p>Of the 189 potential mammary carcinogens in food contact materials, with 143 of these found in plastics and 89 found in paper or cardboard. </p> <p>Of the recently detected chemicals found in food packaging, 40 have already been classified as hazardous by regulatory agencies around the world. </p> <p>Another research scientist, Jenny Kay, from Silent Spring Institute an organisation focused on the link between chemicals, women's health, and breast cancer said: “So many of these chemicals have already been classified as human health hazards, yet they are still allowed to be used in food contact materials thus allowing them to migrate into the food we eat." </p> <p>Early-onset breast cancer rates in women younger than 50 have been increasing, and experts said the trend cannot be explained by genetics alone. </p> <p>“Many of the mammary carcinogens are hormone disruptors, too, and many of the chemicals on our list can also damage DNA," Kay said. </p> <p>“Consumers should not have to keep track of all of the scientific literature on what chemicals to avoid. It should be on regulators to recognise the danger and take action.”</p> <p>The Consumer Brands Association, which represents the consumer products industry, said its members adhered to the US Food and Drug Administration’s evidence-based safety standards.</p> <p>“Packaging exists to protect and keep food safe for consumption,” the association’s senior vice president of product policy and federal affairs Sarah Gallo told <em>CNN</em>. </p> <p>“The FDA reviews and approves food contact substances through their science and risk-based system before they go to market.</p> <p>“The agency’s post-market review also provides continuous safety analysis and regulation of the approved substances.”</p> <p><em>Image: Shutterstock</em></p> <p> </p>

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For type 2 diabetes, focusing on when you eat – not what – can help control blood sugar

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/evelyn-parr-441878">Evelyn Parr</a>, <a href="https://theconversation.com/institutions/australian-catholic-university-747">Australian Catholic University</a> and <a href="https://theconversation.com/profiles/brooke-devlin-2237174">Brooke Devlin</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p>Type 2 diabetes affects <a href="https://www.aihw.gov.au/reports/diabetes/diabetes/contents/how-common-is-diabetes/type-2-diabetes">1.2 million Australians</a> and accounts for <a href="https://www.diabetesaustralia.com.au/about-diabetes/type-2-diabetes/">85-90%</a> of all diabetes cases. This chronic condition is characterised by high blood glucose (sugar) levels, which carry serious <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(17)30058-2/abstract">health</a> risks. <a href="https://www.nature.com/articles/nrendo.2017.151">Complications</a> include heart disease, kidney failure and vision problems.</p> <p>Diet is an important way people living with type 2 diabetes manage blood glucose, alongside exercise and medication. But while we know individualised, professional dietary advice improves blood glucose, it can be <a href="https://linkinghub.elsevier.com/retrieve/pii/S0168822717317588">complex</a> and is not always <a href="https://www.publish.csiro.au/py/PY13021">accessible</a>.</p> <p><a href="https://www.sciencedirect.com/science/article/pii/S0168822724008039">Our new study</a> looked at the impact of time-restricted eating – focusing on when you eat, rather than what or how much – on blood glucose levels.</p> <p>We found it had similar results to individualised advice from an accredited practising dietitian. But there were added benefits, because it was simple, achievable, easy to stick to – and motivated people to make other positive changes.</p> <h2>What is time-restricted eating?</h2> <p>Time-restricted eating, also known as <a href="https://www.annualreviews.org/content/journals/10.1146/annurev-nutr-082018-124320">the 16:8 diet</a>, became popular for weight loss around 2015. Studies have since shown it is also an <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2811116">effective way</a> for people with type 2 diabetes to manage blood glucose.</p> <p>Time-restricted eating involves limiting when you eat each day, rather than focusing on what you eat. You restrict eating to a window during daylight hours, for example between 11am and 7pm, and then fast for the remaining hours. This can sometimes naturally lead to also eating less.</p> <p>Giving your body a break from constantly digesting food in this way helps align eating with natural <a href="https://doi.org/10.1111/jne.12886">circadian rhythms</a>. This <a href="https://doi.org/10.1111/jnc.15246">can help</a> regulate metabolism and improve overall health.</p> <p>For people with type 2 diabetes, there may be specific benefits. They often have their <a href="https://doi.org/10.2337/dc12-2127">highest blood glucose</a> reading in the morning. Delaying breakfast to mid-morning means there is time for physical activity to occur to help reduce glucose levels and prepare the body for the first meal.</p> <h2>How we got here</h2> <p>We ran an <a href="https://www.mdpi.com/2072-6643/12/11/3228">initial study</a> in 2018 to see whether following time-restricted eating was achievable for people with type 2 diabetes. We found participants could easily stick to this eating pattern over four weeks, for an average of five days a week.</p> <p>Importantly, they also had improvements in blood glucose, spending less time with high levels. <a href="https://www.mdpi.com/2072-6643/12/2/505">Our previous research</a> suggests the reduced time between meals may play a role in how the hormone insulin is able to reduce glucose concentrations.</p> <p><a href="https://doi.org/10.1001/jamanetworkopen.2023.39337">Other studies</a> have confirmed these findings, which have <a href="https://doi.org/10.1186/s12986-021-00613-9">also shown</a> notable improvements in HbA1c. This is a <a href="https://www.ncbi.nlm.nih.gov/books/NBK304271/">marker</a> in the blood that represents concentrations of blood glucose over an average of three months. It is the <a href="https://journals.sagepub.com/doi/10.4137/BMI.S38440">primary clinical tool</a> used for diabetes.</p> <p>However, these studies provided intensive support to participants through weekly or fortnightly meetings with researchers.</p> <p>While we know this level of support <a href="https://www.nature.com/articles/0802295">increases</a> how likely people are to stick to the plan and improves outcomes, it is not readily available to everyday Australians living with type 2 diabetes.</p> <h2>What we did</h2> <p>In our <a href="https://www.sciencedirect.com/science/article/pii/S0168822724008039">new study</a>, we compared time-restricted eating directly with advice from an <a href="https://dietitiansaustralia.org.au/working-dietetics/standards-and-scope/role-accredited-practising-dietitian">accredited practising dietitian</a>, to test whether results were similar across six months.</p> <p>We recruited 52 people with type 2 diabetes who were currently managing their diabetes with up to two oral medications. There were 22 women and 30 men, aged between 35 and 65.</p> <p>Participants were randomly divided into two groups: diet and time-restricted eating. In both groups, participants received four consultations across the first four months. During the next two months they managed diet alone, without consultation, and we continued to measure the impact on blood glucose.</p> <p>In the diet group, consultations focused on changing their diet to control blood glucose, including improving diet quality (for example, eating more vegetables and limiting alcohol).</p> <p>In the time-restricted eating group, advice focused on how to limit eating to a nine-hour window between 10am and 7pm.</p> <p>Over six months, we measured each participant’s blood glucose levels every two months using the HbA1c test. Each fortnight, we also asked participants about their experience of making dietary changes (to what or when they ate).</p> <h2>What we found</h2> <p>We found time-restricted eating was as effective as the diet intervention.</p> <p>Both groups had reduced blood glucose levels, with the greatest improvements occurring after the first two months. Although it wasn’t an objective of the study, some participants in each group also lost weight (5-10kg).</p> <p>When surveyed, participants in the time-restricted eating group said they had adjusted well and were able to follow the restricted eating window. Many told us they had family support and enjoyed earlier mealtimes together. Some also found they slept better.</p> <p>After two months, people in the time-restricted group were looking for more dietary advice to further improve their health.</p> <p>Those in the diet group were less likely to stick to their plan. Despite similar health outcomes, time-restricted eating seems to be a simpler initial approach than making complex dietary changes.</p> <h2>Is time-restricted eating achievable?</h2> <p>The main barriers to following time-restricted eating are social occasions, caring for others and work schedules. These factors may prevent people eating within the window.</p> <p>However, there are many benefits. The message is simple, focusing on when to eat as the main diet change. This may make time-restricted eating more translatable to people from a wider variety of socio-cultural backgrounds, as the types of foods they eat don’t need to change, just the timing.</p> <p>Many people don’t have access to more individualised support from a dietitian, and receive nutrition advice from their GP. This makes time-restricted eating an alternative – and equally effective – strategy for people with type 2 diabetes.</p> <p>People should still try to stick to <a href="https://www.eatforhealth.gov.au/guidelines/guidelines">dietary guidelines</a> and prioritise vegetables, fruit, wholegrains, lean meat and healthy fats.</p> <p>But our study showed time-restricted eating may also serve as stepping stone for people with type 2 diabetes to take control of their health, as people became more interested in making diet and other positive changes.</p> <p>Time-restricted eating might not be appropriate for everyone, especially people on medications which don’t recommend fasting. Before trying this dietary change, it’s best speak to the healthcare professional who helps you manage diabetes.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241472/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/evelyn-parr-441878">Evelyn Parr</a>, Research Fellow in Exercise Metabolism and Nutrition, Mary MacKillop Institute for Health Research, <a href="https://theconversation.com/institutions/australian-catholic-university-747">Australian Catholic University</a> and <a href="https://theconversation.com/profiles/brooke-devlin-2237174">Brooke Devlin</a>, Lecturer in Nutrition and Dietetics, School of Human Movement and Nutrition Sciences, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/for-type-2-diabetes-focusing-on-when-you-eat-not-what-can-help-control-blood-sugar-241472">original article</a>.</em></p> </div>

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Olympic champion inducted to Sport Australia Hall of Fame

<p>Olympic gold medallist Sally Pearson and surfing legend Mick Fanning have joined the most elite group of Australian sportspeople, after being inducted to the Sport Australia Hall of Fame (SAHOF). </p> <p>Pearson is one of only nine Australian women to win an Olympic track and field gold medal, winning her first gold in London 2012. She won a silver medal in 2008 for the 100m hurdles, and has World Championship success in 2011 and 2017.</p> <p>She is also the first Australian to be named World Athlete of the year, and won the SAHOF’s “The Don” Award twice. </p> <p> Pearson said it was “surreal” to be included in such esteemed company, including the likes of Cathy Freeman, her childhood hero.</p> <p>“I don’t think it’s really sunk in. It’s so surreal. It feels like it just happens to people you see on TV,” she said.</p> <p>“I still feel like I’m watching the Sydney Olympics and watching Cathy Freeman run. When Steve Hooker won gold in Beijing I was sitting on the sidelines.</p> <p>“Even though I won silver, I was thinking, this is really cool. I’m watching this person, this athlete, just doing amazing things. It’s a bizarre feeling that I’m one of those people now.”</p> <p>Surfing legend Mick Fanning, who is already a member of the World Surfers’ Hall of Fame and Australian Surfing Hall of Fame and said he was pretty “flabbergasted” to be elevated into the SAHOF. </p> <p>“Australia produces so many incredible sporting stars and to be honoured as one of those, among the greats, I’m pretty flabbergasted, to be honest,” he said.</p> <p>“It’s not something that we ever look for when we’re doing our sport, but to be acknowledged later in life is very special and I’m very honoured to be able to share it with people who have supported me.</p> <p>“I wasn’t the most talented person, I wasn’t the most gifted, I didn’t have the most money or anything like that, but I just gave it my all.’’</p> <p>Fanning enters as a three-time world champion for surfing. </p> <p>Motorsport great Mark Skaife, former Kookaburras’ captain Mark Knowles, lawn bowls trailblazer Karen Murphy and dual-sport Paralympics champion Liesl Tesch are some of the other 2024 inductees. </p> <p><em>Image: Colorsport/ Shutterstock Editorial</em></p>

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I have hay fever. How can I tell what I’m allergic to?

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/ryan-mead-hunter-1480189">Ryan Mead-Hunter</a>, <a href="https://theconversation.com/institutions/curtin-university-873">Curtin University</a></em></p> <p>When we think of spring we think of warming weather, birdsong and flowers. But for many people, this also means the return of their seasonal hay fever symptoms.</p> <p>Around <a href="https://www.abs.gov.au/statistics/health/health-conditions-and-risks/health-conditions-prevalence/latest-release">24% of Australians</a> get hay fever, with sneezing, a runny or blocked nose, and itchy or watery eyes the most common symptoms. In <a href="https://www.healthdirect.gov.au/hay-fever#:%7E:text=Key%20facts,dust%20mites%2C%20and%20animal%20fur">severe cases</a>, this may impact sleep and concentration, or be linked to increased frequency of sinus infections.</p> <p>The exact timing of the symptoms depends on your exposure to an allergen – the thing you’re allergic to. Those impacted by tree pollen (from plane trees or cypress pine, for example) may experience symptoms at different times of the year than those impacted by grass pollen (such as rye grass). This will also vary around the country.</p> <p>In Perth, for example, tree pollen (cypress pine) is generally present in August to October, while grass pollen counts tend to be highest in October to November. Other cities and regions may have longer pollen seasons, which may extend further into summer.</p> <h2>Remind me, how does hay fever impact the body?</h2> <p>What we know colloquially as hay fever is called allergic rhinitis. Exposure to a specific allergen (or allergens) triggers an immune response in the body. This leads to inflammation and swelling of the tissue lining the nasal passages in the nose.</p> <p>A range of <a href="https://www.healthdirect.gov.au/hay-fever#:%7E:text=Key%20facts,dust%20mites%2C%20and%20animal%20fur.">allergens</a> may trigger such a response: pollen (from trees, grass or weeds), dust mites, pet fur, dander, mould and some air pollutants.</p> <p>Those with allergies that are only present for part of the year, such as pollen, experience what we call seasonal hay fever, while those with allergies that may be present at any time, such as dust mites and pet dander, experience perennial hay fever.</p> <h2>Getting a diagnosis</h2> <p>Many people with hay fever self-manage their symptoms by limiting exposure to allergens and using over-the-counter <a href="https://theconversation.com/how-do-hay-fever-treatments-actually-work-and-whats-best-for-my-symptoms-213071">antihistamines and steroid nasal sprays</a>.</p> <p>But this may require assistance from your GP and confirmation that what you’re experiencing is hay fever. Your GP can assess your symptoms and medical history, provide a diagnosis, and help with treating and managing your symptoms.</p> <p>Your GP may also be able help you identify potential allergens, based on when you experience symptoms and the environments to which you’re exposed.</p> <p>If symptoms persist, your GP may suggest allergy testing. They may refer you to a specialist called an immunologist, to determine what particular allergen is causing your symptoms, using <a href="https://www.allergy.org.au/patients/allergy-testing/allergy-testing">skin prick tests or blood tests</a>. Tests typically involve controlled exposure to small quantities of suspected allergens.</p> <p>But note, there are a number of tests marketed online that are unproven and not recommended by reputable bodies.</p> <h2>How else can I work out what I’m allergic to?</h2> <p>For those with seasonal hay fever, resources are available to help manage exposures, based on the flowering seasons for common allergy-related species or through pollen forecasting services.</p> <p>The Australian Society of Clinical Immunology and Allergy provides a <a href="https://www.allergy.org.au/patients/allergic-rhinitis-hay-fever-and-sinusitis/guide-to-common-allergenic-pollen">useful pollen guide</a> for each species and when they’re most likely to cause symptoms, broken down for each state and territory.</p> <p>Pollen monitoring and forecasting services – such as <a href="https://www.perthpollen.com.au/">Perth Pollen</a>, <a href="https://www.melbournepollen.com.au/">Melbourne Pollen</a> and <a href="https://www.sydneypollen.com.au/">Sydney Pollen</a>, as well as for other cities – can help you plan outdoor activities.</p> <p>There are also associated phone apps for these services, which can give notifications when the pollen count is high. You can down load these apps (such as <a href="https://airrater.org/">AirRater</a>, Perth Pollen, Melbourne Pollen and Sydney Pollen) from your preferred app store.</p> <p>Apps such as <a href="https://airrater.org/">AirRater</a> also allow you to enter information about your symptoms, which can then be matched to the environmental conditions at the time (pollen count, temperature, smoke, and so on).</p> <p>Using statistical modelling, the app may be able to establish a link between symptoms and exposure. If a sufficiently high correlation is established, the app can send you notifications when the <a href="https://airrater.org/how-does-it-work/">exposure risk</a> is high. This may prompt you to limit outdoor activities and have any medication readily available.</p> <hr /> <p><em>Further information about managing allergic rhinitis is available from <a href="https://www.healthdirect.gov.au/hay-fever">healthdirect</a> and <a href="https://allergyfacts.org.au/__interest/allergic-rhinitis/">Allergy and Anaphylaxis Australia</a></em><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/ryan-mead-hunter-1480189">Ryan Mead-Hunter</a>, Senior lecturer, School of Population Health, <a href="https://theconversation.com/institutions/curtin-university-873">Curtin University</a></em></p> <p><em>Image </em><em>credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/i-have-hay-fever-how-can-i-tell-what-im-allergic-to-240450">original article</a>.</em></p> </div>

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Scurvy is largely a historical disease but there are signs it’s making a comeback

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p>Scurvy is often considered a historical ailment, conjuring images of sailors on long sea voyages suffering from a lack of fresh fruit and vegetables.</p> <p>Yet doctors in developed countries have recently reported treating cases of scurvy, including Australian doctors who <a href="https://casereports.bmj.com/lookup/doi/10.1136//bcr-2024-261082">reported their findings</a> today in the journal <a href="https://casereports.bmj.com/">BMJ Case Reports</a>.</p> <h2>What is scurvy?</h2> <p>Scurvy is a disease caused by a severe deficiency of vitamin C (ascorbic acid), which is essential for the production of collagen. This protein helps maintain the health of skin, blood vessels, bones and connective tissue.</p> <p>Without enough vitamin C, the body cannot properly repair tissues, heal wounds, or fight infections. This can lead to a range of <a href="https://www.degruyter.com/document/doi/10.1515/9781400884544/html">symptoms</a> including:</p> <ul> <li>fatigue and weakness</li> <li>swollen, bleeding gums or loose teeth</li> <li>joint and muscle pain and tenderness</li> <li>bruising easily</li> <li>dry, rough or discoloured skin (reddish or purple spots due to bleeding under the skin)</li> <li>cuts and sores take longer to heal</li> <li>anaemia (a shortage of red blood cells, leading to further fatigue and weakness)</li> <li>increased susceptibility to infections.</li> </ul> <h2>It historically affected sailors</h2> <p>Scurvy was <a href="https://pubmed.ncbi.nlm.nih.gov/23183299/">common</a> from the 15th to 18th centuries, when naval sailors and other explorers lived on rations or went without fresh food for long periods. You might have heard some of these milestones in the history of the disease:</p> <ul> <li> <p><strong>in 1497-1499</strong>, Vasco da Gama’s crew <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(03)13131-5/fulltext#:%7E:text=After%205%20weeks%20at%20sea,lemons%2C%20clearing%20up%20the%20condition">suffered severely from scurvy</a> during their expedition to India, with a large portion of the crew dying from it</p> </li> <li> <p><strong>from the 16th to 18th centuries</strong>, scurvy was rampant among European navies and explorers, affecting notable figures such as <a href="https://www.jstor.org/stable/26305889">Ferdinand Magellan and Sir Francis Drake</a>. It was considered one of the greatest threats to sailors’ health during long voyages</p> </li> <li> <p><strong>in 1747</strong>, British naval surgeon <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3536506/">James Lind</a> is thought to have conducted one of the first clinical trials, demonstrating that citrus fruit could prevent and cure scurvy. However, it took several decades for his findings to be widely implemented</p> </li> <li> <p><strong>in 1795</strong>, the British Royal Navy officially adopted the <a href="https://journals.sagepub.com/doi/pdf/10.1177/003591572601902602">practice of providing lemon or lime juice to sailors</a>, dramatically reducing the number of scurvy cases.</p> </li> </ul> <h2>Evidence of scurvy re-emerging</h2> <p>In the new case report, doctors in Western Australia <a href="https://casereports.bmj.com/lookup/doi/10.1136//bcr-2024-261082">reported</a> treating a middle-aged man with the condition. In a separate case report, doctors in Canada <a href="https://www.cmaj.ca/content/196/33/E1144">reported</a> treating a 65-year old woman.</p> <p>Both patients presented with leg weakness and compromised skin, yet the doctors didn’t initially consider scurvy. This was based on the <a href="https://www.mdpi.com/2072-6643/12/7/1963">premise</a> that there is abundant vitamin C in our modern food supply, so deficiency should not occur.</p> <p>On both occasions, treatment with high doses of vitamin C (1,000mg per day for at least seven days) resulted in improvements in symptoms and eventually a full recovery.</p> <p>The authors of both case reports are concerned that if scurvy is left untreated, it could lead to inflamed blood vessels (<a href="https://www.mayoclinic.org/diseases-conditions/vasculitis/symptoms-causes/syc-20363435">vasculitis</a>) and potentially <a href="https://www.sciencedirect.com/science/article/pii/S2211419X11001625">cause fatal bleeding</a>.</p> <p>Last year, a major New South Wales hospital undertook a <a href="https://www.mja.com.au/journal/2023/219/10/serum-vitamin-c-status-people-new-south-wales-retrospective-analysis-findings">chart review</a>, where patient records are reviewed to answer research questions.</p> <p>This found vitamin C deficiency was common. More than 50% of patients who had their vitamin C levels tested had either a modest deficiency (29.9%) or significant deficiency (24.5%). Deficiencies were more common among patients from rural and lower socioeconomic areas.</p> <p>Now clinicians are <a href="https://onlinelibrary.wiley.com/doi/full/10.5694/mja2.52146">urged to</a> consider vitamin C deficiency and scurvy as a potential diagnosis and involve the support of a dietitian.</p> <h2>Why might scurvy be re-emerging?</h2> <p>Sourcing and consuming nutritious foods with sufficient vitamin C is unfortunately <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10260575/">still an issue</a> for some people. Factors that increase the risk of vitamin C deficiency include:</p> <ul> <li> <p><strong>poor diet</strong>. People with restricted diets – due to poverty, food insecurity or dietary choices – <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10296835/">may not get enough</a> vitamin C. This includes those who rely heavily on processed, nutrient-poor foods rather than fresh produce</p> </li> <li> <p><strong>food deserts</strong>. In areas where access to fresh, affordable fruits and vegetables is limited (often referred to as food deserts), people may <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC9587807/">unintentionally suffer from a vitamin C deficiency</a>. In some parts of developing countries such as India, lack of access to fresh food is <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10296835/">recognised as a risk</a> for scurvy</p> </li> <li> <p><strong>the cost-of-living crisis</strong>. With greater numbers of people <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC10935407/">unable to pay for fresh produce</a>, people who limit their intake of fruits and vegetables may develop nutrient deficiencies, including scurvy</p> </li> </ul> <ul> <li> <p><strong>weight loss procedures and medications</strong>. Restricted dietary intake due to weight loss surgery or weight loss medications may <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/oby.24067">lead to nutrient deficiencies</a>, such as in this <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC3320124/">case report of scurvy</a> from Denmark</p> </li> <li> <p><strong>mental illness and eating disorders</strong>. Conditions such as depression and anorexia nervosa can lead to severely restricted diets, increasing the risk of scurvy, such as in this <a href="https://pubmed.ncbi.nlm.nih.gov/32291151/">case report</a> from 2020 in Canada</p> </li> <li> <p><strong>isolation</strong>. Older adults, especially those who live alone or in nursing homes, may have <a href="https://doi.org/10.1136//bcr-2024-261082">difficulty</a> preparing balanced meals with sufficient vitamin C</p> </li> <li> <p><strong>certain medical conditions</strong>. People with digestive disorders, malabsorption issues, or those on restrictive medical diets (due to severe allergies or intolerances) can develop scurvy if they are <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8248877/">unable to absorb or consume enough vitamin C</a>.</p> </li> </ul> <h2>How much vitamin C do we need?</h2> <p>Australia’s dietary guidelines <a href="https://www.eatforhealth.gov.au/nutrient-reference-values/nutrients/vitamin-c">recommend</a> adults consume 45mg of vitamin C (higher if pregnant or breastfeeding) each day. This is roughly the amount found in half an orange or half a cup of strawberries.</p> <p>When more vitamin C is <a href="https://www.abs.gov.au/statistics/health/health-conditions-and-risks/australian-health-survey-usual-nutrient-intakes/latest-release">consumed</a> than required, excess amounts leave the body through urine.</p> <p>Signs of scurvy can appear as early as a month after a daily intake of less than 10 mg of vitamin C.</p> <p>Eating vitamin C-rich foods – such as oranges, strawberries, kiwifruit, plums, pineapple, mango, capsicum, broccoli and Brussels sprouts – can resolve symptoms within a few weeks.</p> <p>Vitamin C is also readily available as a supplement if there are reasons why intake through food may be compromised. Typically, the supplements contain 1,000mg per tablet, and the <a href="https://www.eatforhealth.gov.au/nutrient-reference-values/nutrients/vitamin-c">recommended upper limit</a> for daily Vitamin C intake is 2,000mg.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241894/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/lauren-ball-14718">Lauren Ball</a>, Professor of Community Health and Wellbeing, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/scurvy-is-largely-a-historical-disease-but-there-are-signs-its-making-a-comeback-241894">original article</a>.</em></p> </div>

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1 in 5 Australians admit they don’t wash their hands every time they use the toilet

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/christine-carson-109004">Christine Carson</a>, <a href="https://theconversation.com/institutions/the-university-of-western-australia-1067">The University of Western Australia</a></em></p> <p>Do you wash your hands every time you use the toilet? How about before you handle food? Be honest.</p> <p>Australia’s Food Safety Information Council has released its <a href="https://www.foodsafety.asn.au/topic/latest-report-card-on-aussie-handwashing-blokes-still-need-to-do-better-global-handwashing-day-15-october-2024/">latest report card</a> on the country’s hand washing habits. It found 19% of Australians don’t wash their hands every time they use the toilet. Close to half (42%) admit they don’t always wash hands before handling food.</p> <p>So who’s doing well when it comes to hand hygiene, who’s not – and why does it matter?</p> <h2>What did the report find?</h2> <p>The new report surveyed hand washing practices of 1,229 people. Results were consistent with what we’ve learned from <a href="https://www.foodsafety.asn.au/topic/latest-research-shows-improvement-in-aussie-handwashing-but-blokes-still-need-to-do-better-global-handwashing-day-15-october-2023/">similar surveys</a>.</p> <p>Once again, women do better than men at washing their hands after using the toilet, although only slightly (80% of men say they do every time, versus 83% of women). Just 55% of men wash their hands before touching food, compared to 62% of women.</p> <p>Age also seemed to make a difference. Under 34 years old, 69% of people washed their hands every time they used the toilet. Over age 65, that jumped to 86%.</p> <p>Although some of these differences aren’t completely unexpected – such as <a href="https://slate.com/technology/2020/02/women-hand-washing-more-than-men-why-coronavirus.html">the gap</a> between men’s and women’s hand washing habits – the reasons remain unclear.</p> <h2>Why don’t people wash their hands?</h2> <p>Public health messaging often focuses on how to wash hands well. But there’s less research that follows up on how widely people actually adopt these practices. And to understand why – if they are skipping the soap and water – those messages might not be getting through effectively.</p> <p><a href="https://pubmed.ncbi.nlm.nih.gov/33998334/">One study</a> that looked at this question in India asked school children about barriers to hand washing. The vast majority (91%) had low “illness threat perception”. In other words, they simply didn’t perceive a risk of getting sick form not washing their hands after going to the toilet.</p> <p>Interestingly, the inability to see germs with their own eyes was one of the biggest barriers, cited by 46% of the children. But 72% said they would wash their hands if their friends did.</p> <p>It’s tempting to speculate these reasons may also apply to other age groups, but we simply haven’t done enough research to know. People’s reasons for hand washing, or not, likely vary across their lifetime and with their circumstances.</p> <h2>What are the risks?</h2> <p>Urine and faeces contain millions of germs, especially faeces, which has more than <a href="https://theconversation.com/your-poo-is-mostly-alive-heres-whats-in-it-102848">100 billion</a> germs per gram.</p> <p>When you use the toilet and touch surfaces in the bathroom, you will pick up germs. People who skip the hand washing step on the way out take those germs with them when they leave, depositing them on each surface they touch afterwards.</p> <p>You may not get sick yourself, but you’re increasing the spread of bacteria. This can increase the risk of infection and illness for other people, including those with compromised immune systems such as older people and those undergoing common forms of treatment for cancer.</p> <p>Hand washing before cooking and eating is also important. The risk here goes both ways. If you have disease-causing germs on your hands (maybe because you didn’t wash them after the toilet) you may transfer them to the food where they can multiply and even produce toxins. People who eat the food may then get sick, often involving vomiting and diarrhoea.</p> <p>In the other direction, some foods naturally carry germs before cooking – such as <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC7697675/">salmonella and campylobacter bacteria in raw poultry</a>. If you don’t wash your hands after handling these foods you may transfer them to other surfaces and risk spreading infection.</p> <h2>How should I wash my hands?</h2> <p>Follow these three simple tips for hand washing correctly:</p> <ol> <li> <p><strong>wet</strong> your hands and rub them together well to build up a good lather with soap for at least 20 seconds and don’t forget to wash between your fingers and under your nails. You might have to use a nail brush</p> </li> <li> <p><strong>rinse</strong> well under running water to remove the bugs from your hands</p> </li> <li> <p><strong>dry</strong> your hands thoroughly on a clean towel for at least 20 seconds. Touching surfaces with moist hands encourages bugs to spread from the surface to your hands.</p> </li> </ol> <h2>What about hand sanitiser?</h2> <p>If no running water is available, use an alcohol-based hand sanitiser. These rapidly inactivate a wide range of germs, rendering them non-infectious. Hand sanitisers are effective against a <a href="https://www.ncbi.nlm.nih.gov/books/NBK513254/#_article-17334_s3_">wide range of bacteria and viruses</a> that can cause many common gastrointesintal and respiratory infections.</p> <p>However if your hands are soiled with organic matter – such as blood, faeces, meat, sand or soil – they won’t be effective. In that case you should clean your hands with soap and water.</p> <h2>The bottom line</h2> <p>Hand washing is a bit like wearing a seat belt — you do that every time you get in a car, not just on the days you “plan” to be involved in an accident. The bottom line is hand washing is a simple, quick intervention that benefits you and those around you — but only if you do it.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/241481/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/christine-carson-109004">Christine Carson</a>, Senior Research Fellow, School of Medicine, <a href="https://theconversation.com/institutions/the-university-of-western-australia-1067">The University of Western Australia</a></em></p> <p><em>Image credits: Shutterstock</em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/1-in-5-australians-admit-they-dont-wash-their-hands-every-time-they-use-the-toilet-241481">original article</a>.</em></p> </div>

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Readers response: How do you handle changes in energy levels as you age?

<p>As we get older, our levels of energy, ability and agility can slowly start to decrease, making us change our day-to-day lifestyles. </p> <p>We asked our readers how they handle these changes, and the response was overwhelming. Here's what they said. </p> <p><strong>Margo Courtney</strong> - Eat clean and healthy and your body will reward you with heaps of energy and vitality. I have a very big green smoothie most days as one of my 2 meals, along with 2 litres of water a day, and I don't even need much sleep.</p> <p><strong>Ron Stubbs</strong> - Up at 8am, can’t be late for my walk in the sun, and feeling great. Don’t need afternoon snooze then. I’m 77.</p> <p><strong>Kristeen Bon</strong> - I don’t handle them. I flop on the couch most afternoons for a quick five minute interior eye check!</p> <p><strong>Sylvia Brice</strong> - I have an autoimmune disease so my levels of energy are way down. I do what l can in small bursts and rest when l need to. Luckily l read and craft so can always do them. It's very hard to adapt but that's life and l am so much better for off than younger people with my disease. Think positive.</p> <p><strong>Judie Fisher</strong> - Do chores in small stretches, and have regular breaks.</p> <p><strong>Diane Green</strong> - Adjust. I do what I can, and what I can't just has to wait.</p> <p><strong>Raymond Richards</strong> - As they told us at the heart clinic, if you have something you HAVE to do - do it first.</p> <p><strong>Janis St George</strong> - Listen to your body - rest awhile when you need to.</p> <p><strong>Kaylene Samuels</strong> - Have a SCAN..... Seniors Compulsory Afternoon Nap.</p> <p><em>Image credits: Shutterstock </em></p>

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Why do I have hay fever? I didn’t have it as a child

<div class="theconversation-article-body"><em><a href="https://theconversation.com/profiles/janet-davies-103598">Janet Davies</a>, <a href="https://theconversation.com/institutions/queensland-university-of-technology-847">Queensland University of Technology</a> and <a href="https://theconversation.com/profiles/joy-lee-1480523">Joy Lee</a>, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a></em></p> <p>Hay fever (or allergic rhinitis) is a long-term inflammatory condition that’s incredibly common. It affects about <a href="https://www.abs.gov.au/statistics/health/health-conditions-and-risks/national-health-survey-state-and-territory-findings/latest-release">one-quarter</a> of Australians.</p> <p>Symptoms vary but <a href="https://www.allergy.org.au/patients/fast-facts/hay-fever-allergic-rhinitis">can include</a> sneezing, itchy eyes and a runny or blocked nose. Hay fever can also contribute to sinus and ear infections, snoring, poor sleep and asthma, as well as lower performance at school or work.</p> <p>But many people didn’t have hay fever as a child, and only develop symptoms as a teenager or adult.</p> <p>Here’s how a combination of genetics, hormones and the environment can lead to people developing hay fever later in life.</p> <h2>Remind me, what is hay fever?</h2> <p>Hay fever is caused by the nose, eyes and throat coming into contact with a substance to which a person is allergic, known as an allergen.</p> <p>Common sources of outside allergens include airborne grass, weed or tree pollen, and mould spores. Pollen allergens can be carried indoors on clothes, and through open windows and doors.</p> <p>Depending on where you live, you may be exposed to a range of pollen types across the pollen season, but grass pollen is the most common trigger of hay fever. In <a href="https://www.sciencedirect.com/science/article/abs/pii/S0013935122010891?via%3Dihub">some regions</a> the grass pollen season can extend from spring well into summer and autumn.</p> <h2>How does hay fever start?</h2> <p>Hay fever symptoms most commonly start in adolescence or young adulthood. <a href="http://dx.doi.org/10.2147/JAA.S170285">One study</a> found 7% of children aged six had hay fever, but that grew to 44% of adults aged 24.</p> <p>Before anyone has hay fever symptoms, their immune system has already been “sensitised” to specific allergens, often allergens of grass pollen. Exposure to these allergens means their immune system has made a particular type of antibody (known as IgE) against them.</p> <p>During repeated or prolonged exposure to an allergen source such as pollen, a person’s immune system may start to respond to another part of the same allergen, or another allergen within the pollen. Over time, these new allergic sensitisations can lead to development of <a href="https://www.jacionline.org/article/S0091-6749(12)00959-1/fulltext">hay fever</a> and possibly other conditions, such as allergic asthma.</p> <h2>Why do some people only develop hay fever as an adult?</h2> <p><strong>1. Environmental factors</strong></p> <p>Some people develop hay fever as an adult simply because they’ve had more time to become sensitised to specific allergens.</p> <p>Migration or moving to a new location can also change someone’s risk of developing hay fever. This may be due to exposure to different <a href="https://www.sciencedirect.com/science/article/abs/pii/S0048969722076884">pollens</a>, <a href="https://www.sciencedirect.com/science/article/pii/S0048969724060194?via%3Dihub">climate and weather</a>, green space <a href="https://onlinelibrary.wiley.com/doi/epdf/10.1111/all.14177">and/or</a> air quality factors.</p> <p>A number of studies <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0105347">show</a> people who have migrated from low- and middle-income countries to higher-income countries may be at a higher risk of developing hay fever. This may due to local environmental conditions influencing expression of genes that regulate the immune system.</p> <p><strong>2. Hormonal factors</strong></p> <p><a href="http://dx.doi.org/10.1016/j.anai.2015.04.019">Hormonal changes</a> at puberty may also help drive the onset of hay fever. This may relate to sex hormones, such as oestrogen and progesterone, <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9392967/#R55">affecting</a> histamine levels, immune regulation, and the response of cells in the lining of the nose and lower airways.</p> <p><strong>3. Genetic factors</strong></p> <p><a href="https://www.nature.com/articles/ng.3985">Our genes</a> underpin <a href="https://www.ncbi.nlm.nih.gov/books/NBK542187/">our risk</a> of hay fever, and whether this and other related allergic disease persists.</p> <p>For instance, babies with the skin condition eczema (known as atopic dermatitis) have a <a href="https://www.annallergy.org/article/S1081-1206(21)00172-1/abstract">three times greater risk</a> of developing hay fever (and asthma) later in life.</p> <p>Having a food allergy in childhood is also a risk factor for developing hay fever later in life. In the case of a peanut allergy, that risk is more than <a href="https://pubmed.ncbi.nlm.nih.gov/27542726/">2.5 times greater</a>.</p> <h2>What are the best options for treatment?</h2> <p>Depending on where you live, avoiding allergen exposures can be difficult. But <a href="https://auspollen.edu.au/auspollensitesmap/">pollen count forecasts</a>, if available, can be useful. These can help you decide whether it’s best to stay inside to reduce your pollen exposure, or to take preventative medications.</p> <p>You may also find <a href="https://www.health.vic.gov.au/environmental-health/epidemic-thunderstorm-asthma-risk-forecast">alerts on thunderstorm asthma</a>, where pollens combine with specific weather conditions to trigger <a href="https://theconversation.com/we-could-see-thunderstorm-asthma-in-south-eastern-australia-this-season-heres-how-to-prepare-215793">breathing difficulties</a>.</p> <p>If you have mild, occasional hay fever symptoms, you can take non-drowsy antihistamines, which you can buy at the pharmacy.</p> <p>However, for more severe or persistent symptoms, intranasal steroid sprays, or an intranasal spray containing a steroid with antihistamine, are the <a href="https://theconversation.com/can-i-take-antihistamines-everyday-more-than-the-recommended-dose-what-if-im-pregnant-heres-what-the-research-says-228390">most effective treatments</a>. However, it is important to use these <a href="https://allergyfacts.org.au/allergic-rhinitis-treatment/">regularly and correctly</a>.</p> <p>Allergen immunotherapy, also known as desensitisation, is an <a href="https://onlinelibrary.wiley.com/doi/10.1111/all.13201">effective treatment</a> for people with severe hay fever symptoms that can reduce the need for medication and avoiding allergens.</p> <p>However, it involves a longer treatment course (about three years), usually with the supervision of an allergy or immunology specialist.</p> <h2>When should people see their doctor?</h2> <p>It is important to treat hay fever, because symptoms can significantly affect a <a href="https://bmjopen.bmj.com/content/10/11/e038870.long">person’s quality of life</a>. A GP can:</p> <ul> <li> <p>recommend treatments for hay fever and can guide you to use them correctly</p> </li> <li> <p>organise blood tests to confirm which allergen sensitisations (if any) are present, and whether these correlate with your symptoms</p> </li> <li> <p>screen for asthma, which commonly exists with hay fever, and may require other treatments</p> </li> <li> <p>arrange referrals to allergy or immunology specialists, if needed, for other tests, such as allergen skin prick testing, or to consider <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-immunotherapy">allergen immunotherapy</a> if symptoms are severe.</p> </li> </ul> <hr /> <p><em>More information about hay fever is available from the <a href="https://www.allergy.org.au/patients/fast-facts/hay-fever-allergic-rhinitis">Australasian Society of Clinical Immunology and Allergy</a> and <a href="https://allergyfacts.org.au/">Allergy &amp; Anaphylaxis Australia</a>.</em><!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/239409/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/janet-davies-103598">Janet Davies</a>, Respiratory Allergy Stream Co-chair, National Allergy Centre of Excellence; Professor and Head, Allergy Research Group, <a href="https://theconversation.com/institutions/queensland-university-of-technology-847">Queensland University of Technology</a> and <a href="https://theconversation.com/profiles/joy-lee-1480523">Joy Lee</a>, Respiratory Allergy Stream member, National Allergy Centre of Excellence; Associate Professor, School of Translational Medicine, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/why-do-i-have-hay-fever-i-didnt-have-it-as-a-child-239409">original article</a>.</em></p> </div>

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Trying to lose weight? Here’s why your genetics could be just as important as your exercise regime

<div class="theconversation-article-body"> <p><em><a href="https://theconversation.com/profiles/henry-chung-1279176">Henry Chung</a>, <a href="https://theconversation.com/institutions/university-of-essex-1291">University of Essex</a>; <a href="https://theconversation.com/profiles/chris-mcmanus-2226445">Chris McManus</a>, <a href="https://theconversation.com/institutions/university-of-essex-1291">University of Essex</a>, and <a href="https://theconversation.com/profiles/sally-waterworth-2226444">Sally Waterworth</a>, <a href="https://theconversation.com/institutions/university-of-essex-1291">University of Essex</a></em></p> <p>Weight loss is a complicated process. There are so many factors involved including your diet, how much sleep you get each night and the kind of exercise you do. Our recent study shows that your <a href="https://www.tandfonline.com/doi/full/10.1080/02701367.2024.2404981">specific genetic profile</a> may also have a dominant effect on how well you lose weight through exercise. This might explain why two people who do an identical workout will see very different results.</p> <p>We identified 14 genes that appeared to significantly contribute to how much weight a person lost through running. This suggests that some of us have a natural talent when it comes to burning fat and losing weight through exercise.</p> <p>To conduct our study, we recruited 38 men and women born in the UK aged between 20 and 40. None of the participants regularly exercised at the start of the study. The group was randomly divided, with one half following a strict eight-week endurance programme that consisted of three weekly runs of 20-30 minutes.</p> <p>The other group acted as a <a href="https://www.britannica.com/science/control-group">control</a>. They were instructed to refrain from exercise and continue their daily routines as normal over this study period, including diet and lifestyle habits.</p> <p>All participants conducted a running test to see how far they could run in 12 minutes, and were weighed before and after the study period. This was to gauge their initial fitness level and see how much they changed over the duration of the study. <a href="https://www.nhs.uk/conditions/obesity/">Body mass index</a> (BMI) was also calculated.</p> <p>Additionally, a saliva sample was collected from each person with a <a href="https://muhdo.com/?gclid=Cj0KCQjwiIOmBhDjARIsAP6YhSUB3WI81JP4Q_snYLhh-SBVNeCJNy2m63C8bKJFvO-nJ5UsHuCCdqMaAhTeEALw_wcB">DNA test kit</a> at the end of the study to assess their unique genetic profile.</p> <p>It’s important to note that everyone who participated in the study had a similar body weight, BMI and aerobic fitness level at the start of the study. This is beneficial for <a href="https://casp-uk.net/news/homogeneity-in-research/">multiple reasons</a>. It meant everyone was at the same starting point, and some <a href="https://www.sciencedirect.com/topics/nursing-and-health-professions/confounding-variable">confounding variables</a> were already controlled for such as <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10128125/">fitness level</a>. This ultimately improves accuracy in interpreting the results.</p> <h2>Exercise genes</h2> <p>Everyone in the exercise group managed to lose weight – around 2kg on average. The control group, on the other hand, put on a little bit of weight.</p> <p>While a 2kg weight loss may not sound like a lot, it’s significant considering the exercise regime only lasted eight weeks and participants made no <a href="https://www.intechopen.com/chapters/87186">changes to their diet</a>.</p> <p>More significant, however, was the large variation in results among those that exercised – with an up to 10kg difference in weight loss between some of the participants. In fact, everyone within the exercise group improved at different rates.</p> <p>Since we controlled for factors such as the <a href="https://pubmed.ncbi.nlm.nih.gov/3529283/">intensity, duration and frequency</a> of the exercises and used participants who’d had a similar body weight and fitness level at the start of the study, this suggests that some people naturally benefited more than others from endurance training.</p> <p>When we looked at the genetic profiles of our participants, we found that differences in each person’s response to the exercise was strongly associated with their specific genetics.</p> <p>We showed there was a strong linear correlation between the amount of weight participants lost and 14 genes that have previously been shown to be associated with body weight, metabolism or <a href="https://www.nature.com/articles/s41380-018-0017-5">psychological conditions</a> that affect BMI. The greater number of these genes a participant had, the more weight they lost. Our results also revealed that around 63% of the variance in weight lost among participants were explained by the genes identified.</p> <p>For example, research has shown the <a href="https://www.ncbi.nlm.nih.gov/gene/10891">PPARGC1A gene</a> plays a role in metabolism and the <a href="https://link.springer.com/article/10.1007/S11033-020-05801-Z">use of fats for energy</a> while exercising. Our study found that all participants who lost more than 1.5kg from exercise had this gene. Those who lost less than this did not have this gene.</p> <p>Our findings align with what <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0249501&amp;s2=P875440273_1683331208925004155">previous studies</a> have shown. But while previous papers have only looked at the link between individual genes and weight loss, ours is the first to show that 14 different genes appear to work in combination to affect whether a person loses weight from endurance exercise.</p> <h2>Piece of the puzzle</h2> <p>Our study also suggests that while some people possess genes that make it easier for them to get fit and lose weight, people with these favourable genetics can only flourish if they actually exercise. In fact, our control group also had a number of these listed genes, but without exercise these genes could not activate, and so the participants did not lose any weight.</p> <p>While our study provides compelling findings, it’s not without limitations. Since we only looked at endurance-based exercise, it will be important for future studies to investigate whether there are similar links between weight loss, genetics and combinations of different types of training (such as a mixture of endurance and strength sessions into a training plan).</p> <p>It’s also worth mentioning that exercise is only <a href="https://www.who.int/activities/controlling-the-global-obesity-epidemic">one piece of the puzzle</a> when it comes to weight loss. So even if you have all 14 of these genes, you won’t lose any weight or get fit if you don’t exercise and maintain a healthy diet and sleep pattern.</p> <p>On the flip side, someone that only has a few of these favourable genes can still benefit if they exercise and are mindful of other aspects of their lifestyle.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/240506/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https://theconversation.com/republishing-guidelines --></p> <p><em><a href="https://theconversation.com/profiles/henry-chung-1279176">Henry Chung</a>, Lecturer in Sport and Exercise Science, <a href="https://theconversation.com/institutions/university-of-essex-1291">University of Essex</a>; <a href="https://theconversation.com/profiles/chris-mcmanus-2226445">Chris McManus</a>, Lecturer, School of Sport, Rehabilitation and Exercise Sciences, <a href="https://theconversation.com/institutions/university-of-essex-1291">University of Essex</a>, and <a href="https://theconversation.com/profiles/sally-waterworth-2226444">Sally Waterworth</a>, Lecturer, School of Sport, Rehabilitation and Exercise Sciences, <a href="https://theconversation.com/institutions/university-of-essex-1291">University of Essex</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/trying-to-lose-weight-heres-why-your-genetics-could-be-just-as-important-as-your-exercise-regime-240506">original article</a>.</em></p> </div>

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