{"id":16094,"date":"2026-10-27T19:16:33","date_gmt":"2026-10-27T19:16:33","guid":{"rendered":"https:\/\/happytummy.aashirvaad.com\/en\/?p=16094"},"modified":"2026-10-27T19:16:35","modified_gmt":"2026-10-27T19:16:35","slug":"circadian-rhythm-gut-health","status":"publish","type":"post","link":"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/","title":{"rendered":"Circadian Rhythm and Gut Health: How Your Gut Keeps Time"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6ae1119db537a\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #4d948b;color:#4d948b\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #4d948b;color:#4d948b\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6ae1119db537a\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#What_is_the_circadian_rhythm_and_does_the_gut_really_have_its_own_clock\" >What is the circadian rhythm, and does the gut really have its own clock?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#What_does_your_gut_do_differently_through_the_day\" >What does your gut do differently through the day?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#What_sets_your_guts_clock_light_or_food\" >What sets your gut\u2019s clock: light or food?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#What_happens_when_your_body_clocks_fall_out_of_step\" >What happens when your body clocks fall out of step?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#Does_a_bad_nights_sleep_affect_your_gut_the_next_day\" >Does a bad night\u2019s sleep affect your gut the next day?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#How_much_of_this_is_proven_in_people\" >How much of this is proven in people?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#Where_the_evidence_stands\" >Where the evidence stands<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#So_what_does_this_mean_for_your_day\" >So what does this mean for your day?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#Before_You_Go\" >Before You Go<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/happytummy.aashirvaad.com\/en\/fitness-wellbeing\/circadian-rhythm-gut-health\/#Sources\" >Sources<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">Yes, your gut runs on a clock. Circadian rhythms help coordinate digestion across the day. A master clock in the brain, set mainly by light and dark, keeps time for the whole body, and <a href=\"https:\/\/www.nigms.nih.gov\/education\/fact-sheets\/Pages\/circadian-rhythms\">nearly every tissue and organ<\/a>, the gut included, has a daily rhythm of its own. That is why digestion isn\u2019t identical at 8 am and 10 pm: a small human study found slower stomach emptying of solids in the evening, the colon is quietest during sleep and busier after waking, and some gut bacteria show daily patterns. When sleep, light and mealtimes keep shifting, those rhythms can fall out of step.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019ve noticed a morning dash to the loo, a late dinner that sits heavily or a tummy that feels different after a weekend lie-in, body-clock science can help explain some of the pattern. Here\u2019s what the gut\u2019s clock is, what it does through the day, what sets it, what knocks it out of step and, just as usefully, which parts of the story are well established in people and which still come mostly from mice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_circadian_rhythm_and_does_the_gut_really_have_its_own_clock\"><\/span>What is the circadian rhythm, and does the gut really have its own clock?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Circadian comes from the Latin circa diem, \u2018about a day\u2019. The US National Institute of General Medical Sciences (NIGMS) describes circadian rhythms as the <a href=\"https:\/\/www.nigms.nih.gov\/education\/fact-sheets\/Pages\/circadian-rhythms.aspx\">physical, mental and behavioural changes<\/a> we go through over a 24-hour cycle. In humans, the master clock is a small group of nerve cells in the brain called the suprachiasmatic nucleus, or SCN, and its job is to keep the body\u2019s other clocks in step.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Those other clocks are everywhere. According to NIGMS, nearly every tissue and organ has its own circadian rhythm, and the digestive system is no exception. Think of the SCN as the conductor, and the clocks in your stomach, intestines and liver as section leaders. Most of the time they follow the conductor. But they can also take cues of their own, and that is where your daily routine comes in.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_does_your_gut_do_differently_through_the_day\"><\/span>What does your gut do differently through the day?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Quite a lot, though the evidence is stronger for some parts of the gut than others. Here\u2019s the short version, with an honest note on how sure we are:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Where<\/strong><\/td><td><strong>What changes across the day<\/strong><\/td><td><strong>How sure are we?<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Stomach<\/strong><\/td><td>In one study, the solid part of a meal took longer to leave the stomach in the evening.<\/td><td>Human evidence from one small, older study.<\/td><\/tr><tr><td><strong>Colon<\/strong><\/td><td>Activity is reduced during sleep and rises on waking and after meals.<\/td><td>Consistent across human recordings.<\/td><\/tr><tr><td><strong>Gut bacteria<\/strong><\/td><td>Some groups show daily patterns in their relative abundance.<\/td><td>Observed in human samples; much mechanistic work comes from mice.<\/td><\/tr><tr><td><strong>Gut lining<\/strong><\/td><td>Experimental circadian disruption can increase intestinal permeability.<\/td><td>Shown in mice; not proof that irregular meals cause a \u201cleaky gut\u201d in people.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Daily patterns also reflect sleep, food and movement. A change by clock time alone does not prove that an internal clock caused it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The stomach can slow down in the evening.<\/strong> In a <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/3609660\/\">1987 study of 16 healthy men<\/a>, the solid part of a meal took about 54% longer to half-empty from the stomach at 8 pm than at 8 am. Liquids showed no such difference. It\u2019s one small, older study, rather than a universal rule about dinner. For people troubled by reflux, leaving a gap between eating and lying down can help, as we explain in <a href=\"https:\/\/happytummy.aashirvaad.com\/en\/healthy-eating\/late-night-eating-and-your-gut\/\">late-night eating and your gut<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The colon takes the night off.<\/strong> Well, it slows down rather than stopping. <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC1432711\/\">Recordings of colonic pressure over 24 hours in healthy adults<\/a> show the colon is quietest during sleep, with activity rising on waking and after meals. A <a href=\"https:\/\/www.frontiersin.org\/journals\/physiology\/articles\/10.3389\/fphys.2023.1239278\/full\">2023 review of colonic rhythms<\/a> notes that the strongest contractions, the ones that move stool along, are relatively rare at night and become more frequent just before or on waking, before breakfast. That\u2019s why so many people need the loo soon after getting up, and why breakfast, arriving just as the colon is stirring, so often seals the deal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Your gut bacteria may keep time too.<\/strong> In an analysis of <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/32619440\/\">1,976 adults in a German population cohort<\/a>, specific gut microbes showed 24-hour patterns in their relative abundance. That means the share of the sampled microbial community accounted for by particular groups varied with the time of day. Much of what we know about why comes from mice, where these daily swings <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/25417104\/\">follow the animals\u2019 feeding rhythms<\/a>. How neatly those mechanisms translate to people is still being worked out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_sets_your_guts_clock_light_or_food\"><\/span>What sets your gut\u2019s clock: light or food?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both, and that\u2019s the crux of it. Light is the master clock\u2019s main cue: NIGMS notes that <a href=\"https:\/\/www.nigms.nih.gov\/education\/fact-sheets\/Pages\/circadian-rhythms.aspx\">light and dark have the biggest influence<\/a> on circadian rhythms, with food intake, physical activity, stress and temperature also playing a part.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Food, though, can provide timing cues to clocks outside the brain. In a <a href=\"https:\/\/openresearch.surrey.ac.uk\/esploro\/outputs\/journalArticle\/Meal-Timing-Regulates-the-Human-Circadian\/99515052802346\">University of Surrey study<\/a>, 10 healthy young men had all their meals moved five hours later. Their blood sugar rhythm shifted by roughly five and a half hours, and a clock-gene rhythm in fat-tissue samples by about an hour. Melatonin and cortisol, used as markers of the brain\u2019s master clock, showed no significant timing shift. The study measured blood sugar and fat tissue rather than the gut itself, but it is a human example of mealtimes shifting some rhythms outside the brain without the master-clock markers following.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So your gut is listening to two signals: light, relayed through the brain, and food, arriving on its own schedule. On an ordinary day they agree. You wake, see daylight, eat breakfast. Repeated changes can make that coordination harder.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_happens_when_your_body_clocks_fall_out_of_step\"><\/span>What happens when your body clocks fall out of step?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One real-world example is shift work, and India has plenty of it: hospital night duty, call centres serving other time zones, factory rotations, delivery riders working past midnight. In a <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20160712\/\">US study of 399 nurses<\/a>, those on rotating day-night shifts were more likely to meet questionnaire criteria for irritable bowel syndrome (48%, against 31% of day-shift nurses) and report abdominal pain (81% against 54%). The IBS association remained after researchers adjusted for age, sex and self-reported sleep quality. A <a href=\"https:\/\/www.sjweh.fi\/article\/2897\">review of shift-work studies<\/a> found associations with digestive symptoms and peptic ulcers, while cautioning that many studies didn\u2019t account for factors such as smoking and age. These are associations, not proof that the clock is to blame, but they point the same way.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You don\u2019t need a night job for your schedule to shift. Researchers use the term <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/16687322\/\">social jetlag<\/a> for the mismatch between biological and social time, often reflected in the difference between sleep timing on workdays and free days. Sleeping two or three hours later at weekends is one familiar example; meals may shift alongside it. Gut-specific research is limited, so read Monday-morning sluggishness as a possible pattern rather than an established effect. <a href=\"https:\/\/www.nhs.uk\/conditions\/jet-lag\/\">Jet lag after crossing time zones can also bring indigestion, nausea or constipation<\/a>; in mice, experiments show that jet lag can disrupt the gut bacteria\u2019s daily rhythm.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Does_a_bad_nights_sleep_affect_your_gut_the_next_day\"><\/span>Does a bad night\u2019s sleep affect your gut the next day?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For some people, it seems to. In a <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37737676\/\">2024 study of 80 people with IBS<\/a>, participants logged their symptoms on a phone app ten times a day for a week. Poor sleep, as they rated it themselves, predicted more abdominal pain and lower-gut symptoms the next day, but not the other way round. Interestingly, sleep measures from a wrist tracker showed no significant link. That difference is worth noticing, but it does not show that feeling rested matters more than getting enough sleep. The study only included people with IBS, so it may not apply to everyone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_much_of_this_is_proven_in_people\"><\/span>How much of this is proven in people?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Body-clock science moves fast, and a lot of what circulates online, from eating windows that \u2018reset\u2019 your gut to precise rules about when to eat fruit, leans on animal studies or goes well beyond them. Here\u2019s where things stand:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_the_evidence_stands\"><\/span>Where the evidence stands<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Well shown in people:<\/strong> light is the master clock\u2019s main cue; the colon is quieter during sleep and busier on waking and after meals.<\/li>\n\n\n\n<li><strong>Shown in small human studies:<\/strong> slower evening stomach emptying of solids; changes in some peripheral rhythms after shifting mealtimes. These are findings from particular protocols, not rules for every person.<\/li>\n\n\n\n<li><strong>Observed in people, explained largely through animal work:<\/strong> daily patterns in the relative abundance of some gut bacteria.<\/li>\n\n\n\n<li><strong>Linked, but not proven to cause:<\/strong> shift work and IBS-type symptoms; self-rated poor sleep and next-day symptoms in IBS.<\/li>\n\n\n\n<li><strong>Mostly animal research so far:<\/strong> circadian disruption increasing intestinal permeability, as in <a href=\"https:\/\/journals.plos.org\/plosone\/article?id=10.1371\/journal.pone.0251604\">simulated shift work in mice<\/a>, and experimental feeding schedules changing gut rhythms. These findings do not establish an eating window that \u201cresets\u201d everyone\u2019s gut.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"So_what_does_this_mean_for_your_day\"><\/span>So what does this mean for your day?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not a stopwatch. Think broadly predictable, not perfect. A few anchors that fit the evidence:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Keep your <a href=\"https:\/\/www.nhlbi.nih.gov\/health\/sleep-deprivation\/healthy-sleep-habits\">wake-up time roughly steady<\/a>, weekends included where you can. If you sleep at night and are awake by day, get some daylight soon after waking. Chai on the balcony or the walk to fetch milk both count.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eat at broadly regular times. Meals provide timing cues, so a predictable pattern gives the body\u2019s clocks something to set by. We\u2019ve covered why <a href=\"https:\/\/happytummy.aashirvaad.com\/en\/dietary-tips\/consistent-meal-timing-gut-health\/\">your gut loves consistency more than perfection<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Give dinner some room before bed if reflux troubles you. For people whose symptoms come on at night, the US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) advises <a href=\"https:\/\/www.niddk.nih.gov\/health-information\/digestive-diseases\/acid-reflux-ger-gerd-adults\/eating-diet-nutrition\">eating at least three hours before lying down<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Protect your sleep, especially if your gut is sensitive. In IBS, a rough night may be followed by a more uncomfortable day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On shifts, aim for as much <a href=\"https:\/\/www.hse.gov.uk\/humanfactors\/topics\/shift-workers.htm\">consistency in sleep and meals as your roster allows<\/a>. Protect your sleep period from light and noise, and keep your doctor in the loop if symptoms persist. Morning-daylight advice is for daytime schedules; if you\u2019re heading to bed after a night shift, light timing needs a different plan. A rotating roster is hard on the body, and that\u2019s not your failing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">None of this needs an eating window or a rigid timetable. If rules about when to eat make you anxious around food, or you have a history of disordered eating, set them aside and talk to a doctor or dietitian instead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A steadier routine can help, but it won\u2019t explain every symptom:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unexplained weight loss, blood in the stool, or persistent abdominal pain need medical assessment. <a href=\"https:\/\/www.nhs.uk\/symptoms\/swallowing-problems-dysphagia\/\">Difficulty swallowing<\/a>, <a href=\"https:\/\/www.nhs.uk\/symptoms\/bleeding-from-the-bottom-rectal-bleeding\/\">black or tarry stools, or bloody diarrhoea<\/a> need urgent medical advice. If symptoms continue, are severe, or keep coming back, speak to a doctor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Seek emergency care for <\/strong><a href=\"https:\/\/www.nhs.uk\/symptoms\/stomach-ache\/\"><strong>sudden severe abdominal pain, vomiting blood<\/strong><\/a><strong>, heavy or continuous rectal bleeding, or abdominal pain with black or tarry stools or an inability to pass stool or gas.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is general information. For children, during pregnancy, or for older adults, follow a doctor\u2019s guidance before making changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your gut has been keeping time all along. Most days, the kindest thing you can do for it is give it a day it can predict.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Before_You_Go\"><\/span>Before You Go<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>For one week:<\/strong> note your wake-up, meal and sleep times alongside how your gut felt. Look for patterns, not perfection. A short log can\u2019t diagnose the cause of symptoms.<\/li>\n\n\n\n<li><strong>Tomorrow:<\/strong> if you keep a daytime schedule, step outside for daylight soon after waking. If you work nights, follow the shift-work advice above rather than seeking morning light just before sleep.<\/li>\n\n\n\n<li><strong>Ask <\/strong><a href=\"https:\/\/happytummy.aashirvaad.com\/happy-tummy-gpt\"><strong>Happy Tummy GPT<\/strong><\/a><strong>:<\/strong> share your usual wake, meal and sleep times, or your shift pattern, and ask for realistic ideas for a steadier routine. It cannot diagnose digestive symptoms or measure your body clock.<\/li>\n\n\n\n<li><strong>Plan it in:<\/strong> explore <a href=\"https:\/\/happytummy.aashirvaad.com\/my-meal-plan\">My Meal Plan<\/a> for help planning meals that fit your week.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sources\"><\/span>Sources<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">1. <a href=\"https:\/\/www.nigms.nih.gov\/education\/fact-sheets\/Pages\/circadian-rhythms\">NIGMS. Circadian Rhythms fact sheet.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/3609660\/\">Goo et al. Circadian variation in gastric emptying of meals in humans. Gastroenterology (1987).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3. <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC1432711\/\">Narducci et al. Twenty four hour manometric recording of colonic motor activity in healthy man. Gut (1987).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4. <a href=\"https:\/\/www.frontiersin.org\/journals\/physiology\/articles\/10.3389\/fphys.2023.1239278\/full\">Hibberd et al. Circadian rhythms in colonic function. Frontiers in Physiology (2023).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/32619440\/\">Reitmeier et al. Arrhythmic Gut Microbiome Signatures Predict Risk of Type 2 Diabetes. Cell Host &amp; Microbe (2020).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/25417104\/\">Thaiss et al. Transkingdom control of microbiota diurnal oscillations promotes metabolic homeostasis. Cell (2014).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7. <a href=\"https:\/\/openresearch.surrey.ac.uk\/esploro\/outputs\/journalArticle\/Meal-Timing-Regulates-the-Human-Circadian\/99515052802346\">Wehrens et al. Meal Timing Regulates the Human Circadian System. Current Biology (2017), University of Surrey research record.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20160712\/\">Nojkov et al. The impact of rotating shift work on the prevalence of irritable bowel syndrome in nurses. American Journal of Gastroenterology (2010).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">9. <a href=\"https:\/\/www.sjweh.fi\/article\/2897\">Knutsson and B\u00f8ggild. Gastrointestinal disorders among shift workers. Scandinavian Journal of Work, Environment &amp; Health (2010).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/16687322\/\">Wittmann et al. Social jetlag: misalignment of biological and social time. Chronobiology International (2006).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">11. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/37737676\/\">Topan et al. Poor Subjective Sleep Quality Predicts Symptoms in Irritable Bowel Syndrome Using the Experience Sampling Method. American Journal of Gastroenterology (2024).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">12. <a href=\"https:\/\/journals.plos.org\/plosone\/article?id=10.1371\/journal.pone.0251604\">Tran et al. Circadian misalignment by environmental light\/dark shifting causes circadian disruption in colon. PLOS ONE (2021). Mouse study.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">13. <a href=\"https:\/\/www.niddk.nih.gov\/health-information\/digestive-diseases\/acid-reflux-ger-gerd-adults\/eating-diet-nutrition\">NIDDK. Eating, Diet, &amp; Nutrition for GER &amp; GERD.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">14. <a href=\"https:\/\/www.nhlbi.nih.gov\/health\/sleep-deprivation\/healthy-sleep-habits\">NHLBI. Healthy Sleep Habits, including strategies for shift workers.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">15. <a href=\"https:\/\/www.hse.gov.uk\/humanfactors\/topics\/shift-workers.htm\">UK Health and Safety Executive. Hints and tips for shift-workers.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">16. <a href=\"https:\/\/www.nhs.uk\/conditions\/jet-lag\/\">NHS. Jet lag.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">17. <a href=\"https:\/\/www.nhs.uk\/symptoms\/stomach-ache\/\">NHS. Stomach ache: warning signs and emergency advice.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">18. <a href=\"https:\/\/www.nhs.uk\/symptoms\/bleeding-from-the-bottom-rectal-bleeding\/\">NHS. Bleeding from the bottom (rectal bleeding).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">19. <a href=\"https:\/\/www.nhs.uk\/symptoms\/swallowing-problems-dysphagia\/\">NHS. Dysphagia (swallowing problems).<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Disclaimer<\/strong><em>: This article is for general information only and is not a substitute for medical advice. If you work shifts and have ongoing digestive symptoms, or have IBS or reflux, follow your doctor\u2019s guidance.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Your gut doesn\u2019t work the same way at 8 am as it does at 10 pm. What the body clock does to digestion, what sets it, what knocks it out of step, and how much of the science holds up.<\/p>\n","protected":false},"author":139,"featured_media":16099,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[6],"tags":[685,251,212,115,217,343,1569,978],"ppma_author":[497],"class_list":["post-16094","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fitness-wellbeing","tag-bowel-movements","tag-circadian-rhythm","tag-digestion","tag-gut-health","tag-gut-microbiome","tag-meal-timing","tag-shift-work","tag-sleep-and-digestion"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Circadian Rhythm and Gut Health: How Your Gut Keeps Time<\/title>\n<meta name=\"description\" content=\"How does circadian rhythm affect gut health? 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Her work spans weight management, women\u2019s health, paediatric nutrition and dietary support for lifestyle-related health conditions. She completed postgraduate study in Food and Nutrition at Lady Irwin College, University of Delhi. Seeing a loved one struggle with ongoing health problems helped shape her interest in nutrition. That personal experience informs her emphasis on education, practical food choices and small, consistent changes that people can sustain. At Happy Tummy, Adrija writes about digestion, fibre, everyday meals and Indian food traditions. Her articles help readers assess nutrition claims and understand the role of ingredients and food preparation in everyday eating. Areas of focus Weight management and nutrition support for lifestyle-related conditions Women\u2019s health, paediatric nutrition and diabetes education Digestive wellbeing, dietary fibre and practical food education Education and training Postgraduate study in Food and Nutrition \u2014 Lady Irwin College, University of Delhi. Training in infant and young child feeding \u2014 National Institute of Public Cooperation and Child Development (2019). Survey methods training \u2014 Lady Irwin College, with IIPS, Mumbai, and UNICEF India (2018). Academic research Her 2019 dissertation examined physical activity, perceived stress, arm circumference and blood pressure among pregnant women in rural communities. It is listed in Lady Irwin College\u2019s departmental research records, under the supervision of Dr Pulkit Mathur.","url":"https:\/\/happytummy.aashirvaad.com\/en\/author\/adrija-regmi\/"}]}},"authors":[{"term_id":497,"user_id":139,"is_guest":0,"slug":"adrija-regmi","display_name":"Adrija Regmi","avatar_url":{"url":"https:\/\/happytummy.aashirvaad.com\/en\/wp-content\/uploads\/2026\/08\/WhatsApp-Image-2026-08-25-at-2.09.14-PM.jpeg","url2x":"https:\/\/happytummy.aashirvaad.com\/en\/wp-content\/uploads\/2026\/08\/WhatsApp-Image-2026-08-25-at-2.09.14-PM.jpeg"},"author_category":"1","first_name":"Adrija","last_name":"Regmi","user_url":"","job_title":"Nutritionist","description":"Adrija Regmi is a nutritionist and certified diabetes educator with over seven years of experience. Her work\r\nspans weight management, women\u2019s health, paediatric nutrition and dietary support for lifestyle-related health\r\nconditions. She completed postgraduate study in Food and Nutrition at Lady Irwin College, University of Delhi.\r\nSeeing a loved one struggle with ongoing health problems helped shape her interest in nutrition. That personal\r\nexperience informs her emphasis on education, practical food choices and small, consistent changes that people\r\ncan sustain.\r\nAt Happy Tummy, Adrija writes about digestion, fibre, everyday meals and Indian food traditions. Her articles\r\nhelp readers assess nutrition claims and understand the role of ingredients and food preparation in everyday\r\neating.\r\n\r\n<strong>Areas of focus<\/strong>\r\n\r\nWeight management and nutrition support for lifestyle-related conditions\r\nWomen\u2019s health, paediatric nutrition and diabetes education\r\nDigestive wellbeing, dietary fibre and practical food education\r\nEducation and training\r\nPostgraduate study in Food and Nutrition \u2014 Lady Irwin College, University of Delhi.\r\nTraining in infant and young child feeding \u2014 National Institute of Public Cooperation and Child Development\r\n(2019).\r\nSurvey methods training \u2014 Lady Irwin College, with IIPS, Mumbai, and UNICEF India (2018).\r\n\r\n<strong>Academic research<\/strong>\r\nHer 2019 dissertation examined physical activity, perceived stress, arm circumference and blood pressure\r\namong pregnant women in rural communities. It is listed in Lady Irwin College\u2019s departmental research records,\r\nunder the supervision of Dr Pulkit Mathur."}],"_links":{"self":[{"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/posts\/16094","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/users\/139"}],"replies":[{"embeddable":true,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/comments?post=16094"}],"version-history":[{"count":3,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/posts\/16094\/revisions"}],"predecessor-version":[{"id":16098,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/posts\/16094\/revisions\/16098"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/media\/16099"}],"wp:attachment":[{"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/media?parent=16094"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/categories?post=16094"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/tags?post=16094"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/happytummy.aashirvaad.com\/en\/wp-json\/wp\/v2\/ppma_author?post=16094"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}