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What causes food cravings? And what can we do about them?

<div class="theconversation-article-body"> <a href="https://theconversation.com/profiles/gabrielle-weidemann-91497">Gabrielle Weidemann</a>, <a href="https://theconversation.com/institutions/western-sydney-university-1092">Western Sydney University</a> and <a href="https://theconversation.com/profiles/justin-mahlberg-1634725">Justin Mahlberg</a>, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a> Many of us try to eat more fruits and vegetables and less ultra-processed food. But why is sticking to your goals so hard? High-fat, sugar-rich and salty foods are simply so enjoyable to eat. And it’s not just you – we’ve evolved that way. These foods <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5928395/">activate</a> the brain’s reward system because in the past they were <a href="https://doi.org/10.1037/a0030684">rare</a>. Now, they’re all around us. In wealthy modern societies we are bombarded by <a href="https://theconversation.com/junk-food-is-promoted-online-to-appeal-to-kids-and-target-young-men-our-study-shows-234285">advertising</a> which intentionally reminds us about the sight, smell and taste of calorie-dense foods. And in response to these powerful cues, our brains respond just as they’re designed to, triggering <a href="https://doi.org/10.1111/obr.12354">an intense urge</a> to eat them. Here’s how food cravings work and what you can do if you find yourself hunting for sweet or salty foods. <h2>What causes cravings?</h2> A food craving is an intense desire or urge to eat something, <a href="https://pubmed.ncbi.nlm.nih.gov/15589112/">often focused on a particular food</a>. We are programmed to learn how good a food tastes and smells and where we can find it again, especially if it’s high in fat, sugar or salt. Something that <a href="https://doi.org/10.1111/obr.12354">reminds us</a> of enjoying a certain food, such as an eye-catching ad or delicious smell, can cause us to <a href="https://doi.org/10.1111/obr.12354">crave it</a>. The cue triggers a physical response, increasing saliva production and gastric activity. These responses are relatively automatic and difficult to control. <h2>What else influences our choices?</h2> While the effect of cues on our physical response is relatively automatic, what we do next is influenced by <a href="https://journals.sagepub.com/doi/pdf/10.1177/1090198107303308">complex</a> factors. Whether or not you eat the food might depend on things like cost, whether it’s easily available, and if eating it would align with your health goals. But it’s usually hard to keep healthy eating in mind. This is because we tend to prioritise a more immediate reward, like the <a href="https://doi.org/10.1016/j.physbeh.2010.04.029">pleasure of eating</a>, over one that’s delayed or abstract – including health goals that will make us feel good in the long term. <a href="https://doi.org/10.1016/S0022-3999(00)00076-3">Stress</a> can also make us eat more. When hungry, we <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8656885/">choose larger portions</a>, underestimate calories and find eating more <a href="https://www.sciencedirect.com/science/article/pii/S0195666315000793">rewarding</a>. <h2>Looking for something salty or sweet</h2> So what if a cue prompts us to look for a certain food, but it’s not available? <a href="https://doi.org/10.1016/j.appet.2014.04.005">Previous research</a> suggested you would then look for anything that makes you feel good. So if you saw someone eating a doughnut but there were none around, you might eat chips or even drink alcohol. But our <a href="https://doi.org/10.1016/j.appet.2024.107640">new research</a> has confirmed something you probably knew: it’s more specific than that. If an ad for chips makes you look for food, it’s likely a slice of cake won’t cut it – you’ll be looking for something salty. Cues in our environment don’t just make us crave food generally, they prompt us to look for certain food “categories”, such as salty, sweet or creamy. <h2>Food cues and mindless eating</h2> Your <a href="https://core.ac.uk/download/pdf/161283824.pdf">eating history</a> and <a href="https://doi.org/10.1002/eat.24179">genetics</a> can also make it harder to suppress food cravings. But don’t beat yourself up – relying on willpower alone is <a href="https://doi.org/10.1016/j.appet.2015.01.004">hard</a> for almost everyone. Food cues are so powerful they can prompt us to <a href="https://doi.org/10.1177/0956797613484043">seek</a> out a certain food, even if we’re not overcome by a particularly <a href="https://doi.org/10.1177/0956797613484043">strong urge</a> to eat it. The effect is more intense if the food is easily available. This helps explain why we can eat an entire large bag of chips that’s in front of us, even though our pleasure decreases as we <a href="https://doi.org/10.1016/0031-9384(81)90310-3">eat</a>. Sometimes we use finishing the packet as the signal to stop <a href="https://doi.org/10.1016/j.physbeh.2015.03.025">eating</a> rather than hunger or desire. <h2>Is there anything I can do to resist cravings?</h2> We largely don’t have control over cues in our environment and the cravings they trigger. But there are some ways you can try and control the situations you make food choices in. <ul> <li> Acknowledge your craving and think about a healthier way to satisfy it. For example, if you’re craving chips, could you have lightly-salted nuts instead? If you want something sweet, you could try fruit. </li> <li> Avoid shopping when you’re hungry, and make a list beforehand. Making the most of supermarket “click and collect” or delivery options can also help avoid ads and impulse buys in the aisle. </li> <li> At home, have fruit and vegetables easily available – and easy to see. Also have other nutrient dense, fibre-rich and unprocessed foods on hand such as nuts or plain yoghurt. If you can, remove high-fat, sugar-rich and salty foods from your environment. </li> <li> Make sure your goals for eating are <a href="https://www.aafp.org/pubs/fpm/issues/2018/0300/p31.html">SMART</a>. This means they are specific, measurable, achievable, relevant and time-bound. </li> <li> Be kind to yourself. Don’t beat yourself up if you eat something that doesn’t meet your health goals. Just keep on trying.<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/237035/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> </li> </ul> <a href="https://theconversation.com/profiles/gabrielle-weidemann-91497">Gabrielle Weidemann</a>, Associate Professor in Psychological Science, <a href="https://theconversation.com/institutions/western-sydney-university-1092">Western Sydney University</a> and <a href="https://theconversation.com/profiles/justin-mahlberg-1634725">Justin Mahlberg</a>, Research Fellow, Pyschology, <a href="https://theconversation.com/institutions/monash-university-1065">Monash University</a> Image credits: Shutterstock 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-causes-food-cravings-and-what-can-we-do-about-them-237035">original article</a>. </div>

Food & Wine

I want to eat healthily. So why do I crave sugar, salt and carbs?

<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> We all want to eat healthily, especially as we reset our health goals at the start of a new year. But sometimes these plans are sabotaged by powerful cravings for sweet, salty or carb-heavy foods. So why do you crave these foods when you’re trying to improve your diet or lose weight? And what can you do about it? There are many reasons for craving specific foods, but let’s focus on four common ones: <h2>1. Blood sugar crashes</h2> Sugar is a key energy source for all animals, and its taste is one of the most basic sensory experiences. Even without specific sweet taste receptors on the tongue, a strong preference for sugar can develop, indicating a mechanism beyond taste alone. Neurons <a href="https://www.nature.com/articles/s41593-021-00982-7">responding to sugar</a> are activated when sugar is delivered to the gut. This can increase appetite and make you want to consume more. Giving into cravings also drives an appetite for more sugar. In the long term, research suggests a high-sugar diet can affect <a href="https://www.bmj.com/content/369/bmj.m2382">mood</a>, digestion and <a href="https://pubmed.ncbi.nlm.nih.gov/33339337/">inflammation</a> in the <a href="https://www.science.org/doi/10.1126/scitranslmed.aay6218?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed">gut</a>. While there’s a lot of <a href="https://www.sciencedirect.com/science/article/pii/S0149763402000040?via%3Dihub#aep-section-id23">variation between individuals</a>, regularly eating sugary and high-carb foods can lead to <a href="https://pubmed.ncbi.nlm.nih.gov/30951762/">rapid spikes and crashes</a> in blood sugar levels. When your blood sugar drops, your body can respond by craving quick sources of energy, often in the form of sugar and carbs because these deliver the fastest, most easily accessible form of energy. <h2>2. Drops in dopamine and serotonin</h2> Certain neurotransmitters, such as <a href="https://pubmed.ncbi.nlm.nih.gov/30595479/">dopamine</a>, are involved in the reward and pleasure centres of the brain. Eating sugary and carb-rich foods can trigger the release of dopamine, creating a pleasurable experience and reinforcing the craving. Serotonin, the feel-good hormone, suppresses <a href="https://www.sciencedirect.com/science/article/pii/S1569733910700886">appetite</a>. Natural changes in serotonin can influence daily fluctuations in mood, energy levels and attention. It’s also associated with eating more <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5829131/">carb-rich snacks in the afternoon</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/21985780/">Low carb diets</a> may reduce serotonin and lower mood. However, a recent systematic review suggests little association between these diets and risk for <a href="https://www.sciencedirect.com/science/article/pii/S0165032722013933?via%3Dihub">anxiety and depression</a>. Compared to men, <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4189179/">women tend to crave more carb rich foods</a>. Feeling irritable, tired, depressed or experiencing carb cravings are part of premenstrual <a href="https://pubmed.ncbi.nlm.nih.gov/29218451/">symptoms</a> and could be <a href="https://www.ncbi.nlm.nih.gov/books/NBK560698/">linked to</a> reduced <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9928757/">serotonin levels</a>. <h2>3. Loss of fluids and drops in blood sugar and salt</h2> Sometimes our bodies crave the things they’re missing, such as hydration or even salt. A low-carb diet, for example, <a href="https://www.ncbi.nlm.nih.gov/books/NBK537084/">depletes</a> insulin levels, decreasing sodium and water retention. <a href="https://www.sciencedirect.com/science/article/pii/S1933287419302673">Very low-carb diets</a>, like ketogenic diets, induce “ketosis”, a metabolic state where the body switches to using fat as its primary energy source, moving away from the usual dependence on carbohydrates. Ketosis is often associated with increased urine production, further contributing to potential fluid loss, electrolyte imbalances and salt cravings. <h2>4. High levels of stress or emotional turmoil</h2> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4214609/">Stress</a>, boredom and emotional turmoil can lead to cravings for comfort foods. This is because stress-related hormones can impact our appetite, satiety (feeling full) and food preferences. The stress hormone <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3425607/">cortisol</a>, in particular, can drive cravings for <a href="https://www.sciencedirect.com/science/article/abs/pii/S0306453000000354">sweet comfort foods</a>. A <a href="https://www.sciencedirect.com/science/article/abs/pii/S0306453000000354">2001 study</a> of 59 premenopausal women subjected to stress revealed that the stress led to higher calorie consumption. <a href="https://pubmed.ncbi.nlm.nih.gov/37295418/">A more recent study</a> found chronic stress, when paired with high-calorie diet, increases food intake and a preference for sweet foods. This shows the importance of a healthy diet during stress to prevent weight gain. <h2>What can you do about cravings?</h2> Here are four tips to curb cravings: 1) don’t cut out whole food groups. Aim for a well-balanced diet and make sure you include: <ul> <li> sufficient protein in your meals to help you feel full and reduce the urge to snack on sugary and carb-rich foods. Older adults should aim for 20–40g protein per meal with a particular focus on <a href="https://onlinelibrary.wiley.com/doi/epdf/10.1111/jhn.12838">breakfast and lunch</a> and an overall daily protein intake of at least <a href="https://apps.who.int/iris/handle/10665/43411">0.8g</a> per kg of body weight for <a href="https://pubmed.ncbi.nlm.nih.gov/35187864/">muscle health</a> </li> <li> fibre-rich foods, such as vegetables and whole grains. These make you feel full and <a href="https://pubmed.ncbi.nlm.nih.gov/32142510/">stabilise your blood sugar</a> levels. Examples include broccoli, quinoa, brown rice, oats, beans, lentils and bran cereals. Substitute refined carbs high in sugar like processed snack bars, soft drink or baked goods for more complex ones like whole grain bread or wholewheat muffins, or nut and seed bars or energy bites made with chia seeds and oats </li> </ul> 2) manage your stress levels. Practise stress-reduction techniques like meditation, deep breathing, or yoga to manage emotional triggers for cravings. Practising <a href="https://pubmed.ncbi.nlm.nih.gov/30570305/">mindful eating</a>, by eating slowly and tuning into bodily sensations, can also reduce daily calorie intake and curb cravings and stress-driven eating 3) get enough sleep. Aim for <a href="https://pubmed.ncbi.nlm.nih.gov/33054337/">seven to eight</a> hours of quality sleep per night, with a minimum of seven hours. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9031614/">Lack of sleep</a> can disrupt hormones that regulate hunger and cravings 4) control your portions. If you decide to indulge in a treat, control your portion size to avoid overindulging. Overcoming cravings for sugar, salt and carbs when trying to eat healthily or lose weight is undoubtedly a formidable challenge. Remember, it’s a journey, and setbacks may occur. Be patient with yourself – your success is not defined by occasional cravings but by your ability to manage and overcome them.<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/212114/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <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> Image credits: Getty Images 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-want-to-eat-healthily-so-why-do-i-crave-sugar-salt-and-carbs-212114">original article</a>.

Food & Wine

Pickle, anyone? 3 possible reasons women get cravings during pregnancy

<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/katelyn-barnes-1238606">Katelyn Barnes</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> From pickles and french fries to oranges and ice cream, women and other people who are pregnant report craving a range of foods while they’re expecting. A <a href="https://www.frontiersin.org/articles/10.3389/fpsyg.2015.00021/full">food craving</a> is a strong urge to eat a specific food. The intense desire to eat is not necessarily related to hunger and can be difficult to ignore or resist. Think: “I must have this now!”. Food cravings during pregnancy are common, with studies reporting anywhere between <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/">50% and 90%</a> of pregnant women experience a food craving at least once during their pregnancy. Most women who experience food cravings will do so in their second trimester (from week 13 to 27), and the cravings may also be <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/">most intense</a> at this time. Let’s delve into the science of food cravings and what it means for the health of mum and bub. <h2>What are some typical cravings, and why do they happen?</h2> There’s an old wives’ tale which implies food cravings can predict the sex of the baby, with sweet foods being associated with a girl, and savoury foods indicating a boy. This isn’t backed by science. In reality, food cravings during pregnancy are highly individual, though they <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/">typically include</a> carbohydrate-dense and protein-dense foods. Commonly reported cravings include biscuits, bananas, nuts, pickles, ice cream and potatoes. We don’t know exactly why pregnant women experience food cravings, but there are a few possible reasons. 1. Changes in nutritional needs Growing a baby takes a lot of work, and unsurprisingly, increases womens’ requirements for energy and specific nutrients such as iron, folic acid, magnesium and calcium. In addition, a woman’s blood volume <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4928162/#:%7E:text=Maternal%20blood%20volume%20increases%20by,falls%20by%2010%20mosmol%2Fkg.">increases significantly during pregnancy</a>, meaning a greater demand for water and electrolytes (in particular sodium and potassium). Some studies suggest women experiencing nutrient deficiencies are <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0276079">more likely</a> to have food cravings. This might mean women crave foods high in energy and specific nutrients based on their needs. However, this link is <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054961/">not consistently seen</a>, and many women experience food cravings without being deficient in any nutrients. 2. Changes in hunger and taste Hormonal changes that occur throughout pregnancy may change how hungry women feel. A specific hormone called neuropeptide Y has been <a href="https://doi.org/10.1006/appe.1996.0060">shown</a> to increase during pregnancy and is associated with increased hunger. Also, many women report foods and drinks taste different during pregnancy. Most commonly, women <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/">report</a> an increased taste of bitter flavours such as those in vegetables or coffee, and a heightened sense of sweetness from fruits. Changes in how foods taste combined with increased feelings of hunger may create food cravings, particularly for sweet foods such as fruits. However, studies have not been able to consistently link hormone levels in blood with reported taste changes, suggesting hormones may not be solely responsible for food cravings. 3. Social and cultural influences Pregnant women in different parts of the world report different food cravings. For example, the most commonly reported food cravings among pregnant women in Nigeria is <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/#B113">fruits and vegetables</a>. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/#B83">Rice</a> is the most common craving among all women in Japan, while in the United States, women seem to crave <a href="https://pubmed.ncbi.nlm.nih.gov/16831486/">chocolate</a> the most. These differences may be due to what foods are available, and what foods are familiar. Popular commentary around pregnancy food cravings, and even the notion of “eating for two”, imply a biological need for pregnant women to indulge their food cravings. These sentiments make eating different, strange, or large amounts of food more socially acceptable. Also, food cravings may normalise eating foods which may be less healthy, such as chocolates or cake. Normalising a food choice that may usually be considered a special treat can then <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/#B76">lead to increased urges</a> for and consumption of those foods during pregnancy. Some women can struggle with food cravings they know are not healthy, but cannot resist. This can <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/">lead to</a> shame and negative relationships with food during pregnancy. <h2>Cravings aren’t a big cause for concern</h2> People may think food cravings lead to excess weight gain in pregnancy, which can be related to poor health outcomes for mothers. But studies to date have shown that while women who experience food cravings in pregnancy have a slightly higher energy intake than those who don’t, there’s <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172095/#B167">no consistent link</a> between food cravings and diet quality, changes in body weight or size, or development of <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054961/">pregnancy complications</a> such as gestational diabetes. Some people have also suspected food cravings in pregnancy might influence the baby while it’s growing. However, studies haven’t found <a href="https://www.sciencedirect.com/science/article/pii/S1658361218301070">a link</a> between the mother’s food cravings during pregnancy, the size of baby at birth, the baby’s taste preferences, or behaviours of developing children. Overall, it seems food cravings have little to modest impact on the health of mothers or their babies. <h2>When to seek help</h2> While all women should feel comfortable to eat foods they desire, moderation is still key. Resolving sweet food cravings with nutritious options such as fruits, dairy and wholegrains may be beneficial, as well as limiting less healthy cravings such as chocolates, lollies and chips. Particular cravings, such soil or ice, can <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4635104/">indicate</a> underlying health conditions that warrant treatment. If you or a loved one is concerned about food cravings or any aspect of food intake during pregnancy, make an appointment with an <a href="https://member.dietitiansaustralia.org.au/Portal/Portal/Search-Directories/Find-a-Dietitian.aspx">accredited dietitian</a>.<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/221755/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <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/katelyn-barnes-1238606">Katelyn Barnes</a>, Postdoctoral Research Fellow, School of Human Movement and Nutrition Sciences, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Image credits: Getty Images 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/pickle-anyone-3-possible-reasons-women-get-cravings-during-pregnancy-221755">original article</a>.

Body

Why do I crave sugar and carbs when I’m sick?

<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> Your nose is running, your head hurts and you feel like you’re coming down with a cold. You’re settling in on the couch for a sick day. Then you reach for the snacks. When you’re sick, your appetite often decreases. So why, at other times, do you crave sugary treats and carbohydrate-loaded comfort foods? A food <a href="https://pubmed.ncbi.nlm.nih.gov/28375878/">craving</a> goes beyond a mere desire to eat, it encompasses a <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7399671/#CR1">complex mix</a> of emotional, behavioural, cognitive and physiological processes. Whether it’s the need for a quick energy source or a temporary relief from discomfort, our bodies and minds work in tandem to drive our food preferences. Here we’ll explore the science behind why our bodies crave sugar and carbs – especially when we’re sick. <h2>Fuelling the immune system</h2> When sickness strikes, our immune system springs into action, requiring additional energy to combat invaders. This heightened activity often leads to an increase in our <a href="https://pubmed.ncbi.nlm.nih.gov/36505552/">metabolic rate</a>, energy demands and nutritional requirements. Sugary treats and carbs are quick sources of energy, satisfying this increased demand. But while a high sugar diet during times of illness may help meet increased metabolic demands, it could also exacerbate the immune and inflammatory response, potentially impeding recovery. In the longer term, high-sugar diets promote chronic <a href="https://pubmed.ncbi.nlm.nih.gov/33339337/">inflammation</a>, <a href="https://www.science.org/doi/10.1126/scitranslmed.aay6218?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed">alter gut microbiota</a> composition, and are associated with chronic disease. For a <a href="https://www.mdpi.com/2072-6643/12/4/1181">well-functioning immune system</a>, aim for a <a href="https://www.who.int/news-room/fact-sheets/detail/healthy-diet">balanced intake</a> of <a href="https://pubmed.ncbi.nlm.nih.gov/31267783/">fruits, vegetables</a>, fibre, protein, and low-glycaemic carbohydrates. <h2>The stress response</h2> Being sick is stressful for the body. Acute mild or intense stress, like we’d see if we’re sick, boosts the “<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5921333/">flight or fight</a>” hormones adrenaline and cortisol. This mobilises stored energy to meet increased demands, but it can also curb appetite. <a href="https://pubmed.ncbi.nlm.nih.gov/31125634/">Prolonged stress</a> can disrupt energy balance, and cause nutritional deficiencies and alterations in gut and brain functions. This can reduce a person’s threshold for craving sugar and salt, increasing their preferences towards energy-dense foods. The stress hormone cortisol can also increase your <a href="https://pubmed.ncbi.nlm.nih.gov/24123563/">preference</a> for high-calorie, comfort foods, which can <a href="https://pubmed.ncbi.nlm.nih.gov/36615866/">temporarily alleviate stress</a>. <h2>The brain’s reward system</h2> Comfort foods trigger your brain’s reward system, releasing feel-good neurotransmitters like <a href="https://pubmed.ncbi.nlm.nih.gov/30595479/">dopamine</a> and serotonin. But “<a href="https://pubmed.ncbi.nlm.nih.gov/30951762/">sugar rushes</a>” are often short-lived and can lead to decreased alertness and heightened fatigue within an hour of consumption. The link between carbohydrates (which the body converts to sugar) and serotonin can be traced back to 1971 when <a href="https://www.science.org/doi/10.1126/science.174.4013.1023?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed">researchers</a> found elevated tryptophan levels (serotonin’s precursor) in rats’ plasma and brains after a carbohydrate-rich diet. Subsequent studies in humans established connections between carbohydrates and mood, especially in relation to <a href="https://pubmed.ncbi.nlm.nih.gov/2903717/">obesity, depression and seasonal affective disorder</a>. Therapies enhancing serotonin have since been shown to <a href="https://pubmed.ncbi.nlm.nih.gov/2903717/">reduce carbohydrate intake</a>. Remarkably, around <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911970/pdf/molecules-27-01680.pdf">90% of serotonin</a> production occurs in the gut. The vast microbial population in our gut exerts a potent influence on <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8106557/">immunity, metabolism</a> and <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8293578/pdf/40168_2021_Article_1093.pdf">appetite</a>. Recent mouse studies have even identified specific microbes linked to <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(22)01750-X">sugar binges after antibiotic treatment</a>. <h2>Some people eat less when they’re sick</h2> Not everyone craves sugar and carbs when they are sick. Some people eat less for a few reasons: <ul> <li> they have less of an appetite. While <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5610818/pdf/JDR2017-4527980.pdf">ghrelin</a> (the “hunger” hormone) levels might initially rise, prolonged illness can suppress appetite due to nausea, fatigue and discomfort. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5921333/">Critically ill</a> patients have reduced food intake and are at risk of malnutrition </li> <li> <a href="https://pubmed.ncbi.nlm.nih.gov/30777142/">metabolic adaptation</a>. The body might slow specific metabolic processes to conserve energy, reducing overall calorie requirements </li> <li> altered taste perception. <a href="https://pubmed.ncbi.nlm.nih.gov/32195512/#:%7E:text=The%20ability%20of%20an%20individual%20to%20perceive%20tastes,intake%2C%20playing%20an%20important%20role%20in%20promoting%20satiation%2Fsatiety.">Taste</a> is an important component that affects both appetite and energy intake. Alterations in taste and smell is a common symptom when we are sick and was common with <a href="https://doi.org/10.1101/2020.04.05.20048421">COVID</a> </li> <li> consuming fluids like water, tea or broths might be more appealing and manageable than solid foods. These fluids provide hydration but contribute minimally to calorie intake.<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/210565/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> </li> </ul> <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> Image credits: Getty Images 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-crave-sugar-and-carbs-when-im-sick-210565">original article</a>.

Body

3 reasons you feel hungrier and crave comfort foods when the weather turns cold

As we move through Autumn, parts of Australia are starting to see cooler weather. For some of us, that can mean increasing feelings of hunger and cravings for “comfort food” such as as pasta, stews and ramen. But what’s happening in our body? <h2>3 things change when it gets cold</h2> 1. Our body conserves heat It sends this energy it conserves to our internal organs so they can maintain their temperature and work properly. The body can also perform heat-generating activities (such as shivering), which uses <a href="https://pubmed.ncbi.nlm.nih.gov/21261804/">energy</a>. The body will then look for additional energy through calories from eating food. 2. Our body warms up when eating When we eat, the body needs to expend energy to digest, absorb, and metabolise the nutrients. This process requires the use of energy, which generates heat in the body, leading to an increase in body temperature termed “<a href="https://pubmed.ncbi.nlm.nih.gov/36012714/">diet-induced thermogenesis</a>”. However, the amount of energy used to keep us warm is quite <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/nonshivering-thermogenesis">modest</a>. 3. Some people experience a drop in the neurotransmitter called serotonin This is partly because the rate our body produces serotonin is related to <a href="https://www.thelancet.com/pdfs/journals/lancet/PIIS0140673602117375.pdf">sunlight</a>, which is lower in winter. Serotonin helps to regulate mood, appetite, and sleep, among other things. When serotonin levels are low, it can lead to increased hunger and decreased satiety (feeling that you’ve had enough to eat), making us feel hungrier and less satisfied after meals. <h2>Why we love comfort food in winter</h2> Many of us struggle to eat salad in winter and crave mum’s chicken soup or a slow cooked, brothy ramen. Research shows our brain detects the cold weather and looks for warm <a href="https://www.mdpi.com/2072-6643/9/6/592">food</a>. Warm food can provide a sense of comfort and cosiness, which is particularly appealing during the colder months when we spend more time indoors. <a href="https://www.sciencedirect.com/science/article/pii/S1878450X16300786">Comfort food</a> can mean something different for everyone. They are foods we reach for in periods of stress, nostalgia, discomfort (like being cold), or emotional turmoil. For most of us, the foods we often over-indulge in are rich and carbohydrate heavy. A drop in serotonin has also been shown to stimulate an urge to eat more <a href="https://pubmed.ncbi.nlm.nih.gov/16340952/">carbohydrate-rich</a> foods such as gnocchi, pasta, ragout, mashed potatoes. <h2>What happens to those extra calories?</h2> If you consume more energy in cooler weather, some of it will be used to keep you warm. Beyond keeping us warm, extra calories we consume are stored. While most humans today have access to a year-round food supply, some research shows our bodies may still have some leftover instincts related to storing energy for the cooler months when food was harder to come by. This behaviour may also be driven by biological factors, such as changes in hormone levels that regulate appetite and <a href="https://www.frontiersin.org/articles/10.3389/fnins.2013.00140/full">metabolism</a>. A fundamental principle of nutrition and metabolism is that the balance between the energy content of food eaten and energy expended to maintain life and to perform physical work affects body <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3302369/">weight</a>. This means any excess energy that we don’t use will be stored – usually as fat. Using mathematical modelling, researchers <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2015.2443">have predicted</a>weight gain is more likely when food is harder to find. Storing fat is an insurance against the risk of failing to find food, which for pre-industrial humans was most likely to happen in winter. <h2>It doesn’t have to be unhealthy</h2> No matter your cravings during cooler months, it’s important to remember your own personal health and wellbeing goals. If you’re worried about excess energy intake, a change in season is a great time to rethink healthy food choices. Including lots of whole fresh vegetables is key: think soups, curries, casseroles, and so on. Including protein (such as meat, fish, eggs, legumes) will keep you feeling fuller for longer. Image credits: Getty Images This article originally appeared on <a href="https://theconversation.com/3-reasons-you-feel-hungrier-and-crave-comfort-foods-when-the-weather-turns-cold-202831" target="_blank" rel="noopener">The Conversation</a>.

Food & Wine

Craving meat? It may be your gut talking

Have you ever had a sudden desire for meat or dairy? Researchers from South Korea have discovered the reason behind these sudden cravings, <a rel="noopener" href="https://dx.doi.org/10.1038/s41586-021-03522-2" target="_blank">reported in Nature</a>. All organisms - including people - require a balanced intake of carbohydrates, proteins and fats to keep functioning normally, and these biomolecules work as both an energy source and the building blocks involved in cell repair, hormone production and other important bodily functions. “Taking in sufficient calories alone won’t do the job,” said Professor Greg Seong-Bae Suh from the Korea Advanced Institute of Science and Technology (KSAT). “If the diet does not include enough proteins, it can still lead to severe forms of malnutrition including kwashiorkor.” To determine the mechanisms behind these cravings, Suh and Professor Lee Won-Jae from Seoul National University (SNU) looked at how different genes affected the food preferences of fruit flies that were deprived of protein. Gut-brain communication The researchers found that a hormone called CNMamide (CNMa) was released from the cells lining the intestines of protein-deprived flies. These cells, called enterocytes, were previously thought to solely digest and absorb food. But, enterocytes can use CNMa to communicate the body’s nutrient status - or what it’s missing - to receptors in the brain’s nerve cells. This then triggers a sudden desire to eat food that contains all of the essential amino acids that are missing, which are found in eggs, fish, and meat. Bacteria lend a helping hand The team also found that certain gut microbes can compensate for mild protein deficiencies. Acetobacter bacteria, for example, can temporarily make amino acids the body is lacking, leading to a decrease in the amount of CNMa released and a drop in the flies’ desire to eat protein-rich foods. Why this matters Though the exact way that CNMa communicates with the brain receptors is unknown, these findings serve as a first insight into why living things need and want protein so much - and what can happen if it’s taken away. “We chose to investigate a simple organism, the fly, [to] make it easier for us to identify and characterise key nutrient sensors,” Professor Suh said. “Because all organisms have cravings, the nutrient sensors and pathways we identified in flies would also be relevant to mammals. This research will greatly advance our understanding of the causes of metabolic disease and eating-related disorders,” he concluded.

Body

Why do people crave tomato juice when flying?

No one likes airplane food, it's a fact. Tucking into that pile of mush can often be as appetising as licking the armpit of the person sitting next to you. And while airline chefs are constantly improving the quality of grub served at 33,000 feet, it turns out that the loud jet noise can also affect passengers' taste buds. In noisy environments sweet foods just taste duller. Savoury foods takes better and richer, causing passengers to crave tomato juice above everything else. But if this is so, what else should you be eating or drinking in flight? Keep drinking that tomato juice, or choose green tea. If you are offered a meal, aim for anything that includes ingredients with umami savoury richness. That includes foods like roasted tomatoes, sautéed mushrooms, aged cheeses, bacon, beef, chicken soup or broth, roasted squash, soy sauce or other savoury foods. <img width="498" height="245" src="https://oversixtydev.blob.core.windows.net/media/29044/image__498x245.jpg" alt="tomato juice plane" style="display: block; margin-left: auto; margin-right: auto;"/> Researchers did not find any effect of airplane noise on passengers' sense of sour, salty or bitter foods, but previous research commissioned by Lufthansa Airlines showed that passengers' sense of salty and sweet tastes diminished by 30 per cent when exposed to low cabin pressure. Time also plays a role in the quality of food on flights, as noted by economist Tyler Cowen in his book An Economist Gets Lunch. "Before deregulation in the 1970s, airline food was often excellent," Cowen writes. "Prices were so high that flying was, for the most part, the province of the wealthy rather than a common American experience, as it is today." As flying became more affordable, however, the food quality started to drop as well. Written by Ellen Creager. First appeared on <a href="http://Stuff.co.nz" target="_blank">Stuff.co.nz</a>. Related links: <a href="/travel/international/2016/08/10-inflight-meals-that-taste-rather-yummy/">10 inflight meals that taste rather yummy</a> <a href="/travel/travel-tips/2016/08/20-secrets-to-enjoying-an-economy-flight/">20 secrets to enjoying an economy flight</a> <a href="/travel/travel-tips/2016/09/10-of-the-most-annoying-things-on-a-flight/">10 of the most annoying things on a flight</a>

Travel Tips

What your body’s cravings really mean

No one is immune to cravings, but if you find yourself frequently having specific hankerings, your body could be trying to tell you something. Carbs – If you’re craving processed carbs such as pasta or bread, your body is likely really craving sugar. Your body processes carbs the same way it process sugars. Sugars in high calorie forms such as carbs or sweets are highly addictive, so excessive amounts can create a vicious cycle. Sugary snacks – If you’re craving candy (without any obvious emotional trigger) you might be consuming too many processed carbs. Because, as stated above, the body treats carbs and sugars in the same way, eating carbs can spike your blood sugar. When it drops back down, you might find yourself craving sugary sweets. Salty snacks – If you’re craving salty snacks such as chips, you might be thirsty. When you consume salt, your body retains more water. If your body is telling you to eat salty foods, try having a glass of water instead. Salt cravings can also indicate a high level of stress hormones in the body, so practicing stress reduction may also help curb the hankering. Meat – If you find yourself craving meat such as hamburgers or steak, this could mean your body is low on protein, iron, zinc, or vitamin B, which are found in red meats. Fried foods – If you’re craving fatty fried foods, this could mean you’re not getting enough sleep. If your body is tired, it might be looking for an instantly satisfying fix, leading you to crave fries or greasy breakfast foods. Chocolate – If you’re craving chocolate, this could be an emotional trigger, since we’ve come to associate chocolate as a comfort food. Additionally, it could represent a deficiency of magnesium, which is essential for healthy skin and hair. Instead of reaching for the chocolate, try eating magnesium rich nuts.

Body

What do your food cravings say about you?

Craving some chocolate? Fantasising about French fries? Busting for some baked goods? Well, your body is telling you something is missing.While we all get a bit peckish, there’s a difference between being hungry and cravings for a specific foods.“Cravings mainly indicate that our body is lacking a specific mineral or nutrient,” Nutritionist Shona Wilkinson, from the NutriCentre, London, told MailOnline.So does that mean next time with have a hankering for some sweets, we should give in? Not exactly.“As descendants from cave men - when the aim was to survive a day on one meal - we are craving food that is either high in fat or high in calories to provide us enough energy. However, these days, we eat five times a day and we no longer need that additional energy or extra calories,” explained Ms Wilkinson.“Unfortunately, due to the fact, most food is processed, we are still missing necessary nutrients in our bodies. Instead of giving into our cravings, it is important to understand them, and give the body exactly what it needs,” she advised.You crave: ChocolateWhat it means: Chocolate is rich in magnesium, so that urge to gorge a block of chocolate could indicate a deficiency in this mineral. Around 80 per cent lack magnesium in their daily diet – a mineral that is vital for bones, skin and hair, supports the immune system and balances the nervous system. Drinks like alcohol, tea, coffee and soft drinks can help deplete levels of magnesium too.Food swap: If you still need a chocolate fix, opt for dark chocolate which is around 70 per cent cocoa. Other foods rick in magnesium include dark, leafy greens, brown rice, wholemeal bread and nuts.You crave: Something sweetWhat it means: You may just be a natural sweet tooth but it could also mean you’re deficient in chromium.Ms Wilkinson explained: “As a person eats, their blood sugar levels surge and insulin is released. If you're eating refined sugar and carbohydrates they will hit your bloodstream fast and cause an imbalance in blood sugar. Your body will release more insulin to deal with this rapid rise in blood sugar.”“Once dealt with, the blood sugar levels will drop, but because you've generated the release of so much insulin, the levels will drop too low and you will soon feel like snacking on a bar of chocolate, or something else sweet. The more sweets you eat, the more you will crave them - it is a catch 22.”Food swap: Make sure you have a healthy breakfast and lunch so by the time it hits the afternoon, you won’t feel like you need a quick sugar fix. Also, eat plenty of chromium-rich liver, kidney, beef, chicken, carrots, potatoes, broccoli, asparagus, wholegrains, and eggs.You crave: SaltWhat it means: Snacking on a packet of crisps could be a sign that sodium levels in the body are too low. Sodium helps maintain water balance in the body and regulates blood pressure.“It is usually due to dehydration, after exercise, illness or drinking alcohol,” said Ms Wilkinson.Food swap: Snack on salted popcorn which is naturally high in sodium. Ms Wilinson also advised: “You can also find small amounts of this mineral in celery and carrots, which should help your craving.”

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What causes food cravings? And what can we do about them?

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Pickle, anyone? 3 possible reasons women get cravings during pregnancy

Why do I crave sugar and carbs when I’m sick?

3 reasons you feel hungrier and crave comfort foods when the weather turns cold

Craving meat? It may be your gut talking

Why do people crave tomato juice when flying?

What your body’s cravings really mean

What do your food cravings say about you?

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