How to Improve Gut Health: What the Microbiome Science Actually Supports

The video is under a minute long. A woman in gym clothes holds up a glass of something green and promises that seven days from now, viewers will have “reset” their gut, flattened their stomach and fixed their brain fog. It has millions of views. Some version of it has been landing in group chats all month.

That is why searches for how to improve gut health are surging again as of September 2026: not because a landmark trial dropped, but because a genre of short-form content has turned a fascinating field of research into a week-long challenge with a shopping list. The science underneath is real and, in places, genuinely exciting. The claims layered on top mostly are not.

This piece sorts one from the other. Each strategy is graded by the kind of evidence behind it, so a reader can tell a cohort-backed habit from a caption.

What does “gut health” actually mean?

Physicians rarely use the phrase “gut health.” They talk about the gut microbiome, which is the community of trillions of bacteria, fungi and viruses living mostly in the large intestine, and about specific conditions with specific names. The wellness world compressed all of that into two words, which is convenient for a headline and slippery for a reader.

Still, the underlying biology is solid. The colon hosts several hundred bacterial species that ferment the fiber humans cannot digest, producing short-chain fatty acids, small molecules such as butyrate that feed the cells lining the colon and appear to calm inflammation. These microbes also train immune cells, help make vitamin K and some B vitamins, and crowd out organisms that cause disease.

What a healthy microbiome looks like is harder to pin down than the internet implies. Researchers generally agree on two markers: diversity, meaning many different species rather than a few dominant ones, and resilience, meaning the community bounces back after a course of antibiotics or a bout of food poisoning. Beyond that, two healthy adults can carry strikingly different microbial populations. There is no single reference “normal.”

That is why this article grades claims instead of ranking hacks. When someone asks how to improve gut health, the honest answer separates three levels of confidence: things shown in randomized trials to change symptoms or measurable markers, things linked to better outcomes in observational studies, and things that sound plausible but have only been tested in mice or petri dishes. Most viral advice lives in that third tier. The first tier is smaller, but it is inexpensive, low-risk and mostly available in a grocery store.

What changed recently in microbiome research

No single blockbuster study appeared this month, and it would be dishonest to pretend one did. The current spike is driven by short videos, not journals. The research base has shifted in a few concrete ways over the past several years, though, and those shifts explain why clinicians now discuss the microbiome with more confidence than they did a decade ago.

In July 2021, Stanford researchers published a randomized trial in the journal Cell in which 36 healthy adults ate either a high-fiber diet or a diet rich in fermented foods for 10 weeks. The fermented-food group showed increased microbial diversity and lower levels of 19 inflammatory proteins in blood. The fiber group did not gain diversity in that window, though participants who started with more diverse microbiomes responded better. It remains one of very few human trials to randomize whole dietary patterns and measure the microbiome directly.

In late 2022 and again in April 2023, the US Food and Drug Administration approved the first two therapies made from screened donor stool, both indicated for preventing recurrence of Clostridioides difficile infection after antibiotic treatment. C. difficile is a bacterium that causes severe diarrhea when normal gut flora are wiped out. Those approvals confirmed that reshaping the microbiome can be a legitimate medical treatment, but only for that narrow indication and only under a clinician’s supervision.

Meanwhile the National Institutes of Health Office of Dietary Supplements keeps an updated professional fact sheet on probiotics that continues to conclude the evidence is strongest for a handful of conditions and weakest for general “gut health” in people without symptoms. The gap between what science supports and what a reset video promises has widened, not narrowed.

What the evidence actually says, graded honestly

Evidence in medicine comes in tiers, and gut advice deserves the same scrutiny as a blood pressure pill. Randomized controlled trials, in which people are assigned by chance to an intervention or a comparison, sit at the top. Observational studies, which follow large groups and look for associations, sit below them because they cannot prove cause. Animal and laboratory work sits lower still. Expert opinion fills gaps but is not proof.

Against that ladder, here is where the major claims land.

• Dietary fiber: randomized trials show fiber improves constipation and lowers LDL cholesterol; large cohorts link high-fiber diets to lower risk of colorectal cancer, type 2 diabetes and heart disease. Strong evidence for health outcomes, moderate for microbiome changes specifically.
• Fermented foods: one well-designed randomized trial plus observational data on yogurt intake. Promising but early; moderate.
• Probiotic supplements: randomized trials support specific strains for specific problems, such as some antibiotic-associated diarrhea and irritable bowel syndrome (IBS), a chronic condition of abdominal pain and altered bowel habit. For healthy people seeking general benefit, trials are small and inconsistent. Condition-specific evidence moderate; general-wellness evidence weak.
• Plant diversity, the “30 plants a week” idea: observational, from the American Gut Project. Plausible, not proven.
• Sleep, exercise, stress reduction: small trials and animal studies for microbiome effects, though each has independently well-established health benefits.
• Resets, detoxes and cleanses: no randomized trials. Expert opinion is skeptical.

The pattern is instructive. The interventions with the deepest evidence are unglamorous and cheap. The ones with the loudest marketing have the thinnest support. That does not automatically make them dangerous, but it should recalibrate expectations before anyone commits a week to cabbage juice.

What are the symptoms of poor gut health?

Search results overflow with lists promising “the 7 signs of an unhealthy gut,” and they tend to blend genuine digestive symptoms with fatigue, skin breakouts, sugar cravings and mood swings. That blending is where the science gets stretched. Bloating, gas, constipation, diarrhea and abdominal discomfort are real gut symptoms with many possible causes. Tiredness and acne have dozens of explanations, and the microbiome is rarely the first one a physician would investigate.

Some patterns do warrant attention. A change in bowel habit lasting more than a few weeks, whether new constipation, new diarrhea or alternating both, deserves evaluation rather than a supplement. Bloating that is constant rather than meal-related, or that keeps worsening, is not background noise. Frequent heartburn, unintended weight change and food intolerances appearing in adulthood all merit a conversation with a clinician, because the possibilities range from IBS to celiac disease, an immune reaction to gluten that damages the small intestine, to inflammatory bowel disease.

The term “dysbiosis,” which simply means an imbalance in the microbial community, is thrown around in consumer content as if it were a diagnosis. It is not. No validated clinical test tells a healthy person their microbiome is “unbalanced,” and there is no agreed threshold for balanced. Researchers describe dysbiosis in people with serious illness by comparing them to controls, but that is a research observation, not a bedside diagnostic.

The useful takeaway is narrower than the viral lists: notice digestive symptoms that are new, persistent or progressive, and treat vague whole-body complaints as reasons for a general checkup rather than proof of a gut problem. The red flags that should never wait are laid out in the final section.

How to improve gut health naturally: fiber and plant variety first

If a reader remembers one thing about how to improve gut health naturally, it should be this: the microbes in the colon eat what you cannot. Fiber, the part of plants that survives digestion in the small intestine, is their primary food. Americans average roughly 15 grams a day. The NHS recommends adults aim for about 30 grams, and US dietary guidance lands in a similar range. Most people are running the colon on a fraction of its intended fuel.

Fiber comes in two broad forms. Soluble fiber, found in oats, beans, lentils, apples and psyllium, dissolves into a gel and is readily fermented into short-chain fatty acids. Insoluble fiber, abundant in whole grains, nuts and vegetable skins, adds bulk and speeds transit. Whole foods deliver both together.

Variety may matter as much as quantity. The American Gut Project, a large crowdsourced study, found that people eating more than 30 different plant types a week had more diverse microbiomes than those eating 10 or fewer. That is observational data and cannot prove cause, but the mechanism is sensible: different fibers feed different species. Herbs, spices, nuts, seeds, legumes, fruits, vegetables and whole grains all count, so 30 is less daunting than it sounds. A pot of mixed-bean chili with onion, garlic, tomato, pepper, cumin and coriander covers nearly ten.

Prebiotics deserve one sentence of definition: they are specific fibers, such as inulin from chicory root or the fructans in onions, garlic and leeks, that selectively feed beneficial bacteria. Supplements exist, but the evidence for whole foods is broader.

Increase fiber gradually over a few weeks and drink more water alongside it. A sudden jump produces gas and bloating that convince many people fiber “does not agree with them,” when the real problem was pace.

Do fermented foods really help the microbiome?

Fermented foods are foods transformed by live microbes: yogurt, kefir, kimchi, sauerkraut, miso, tempeh, some kombuchas and traditionally brined pickles. The Stanford trial is the reason they moved from folk wisdom to serious contender. Over 10 weeks, adults eating about six servings a day saw microbial diversity rise steadily, and 19 markers of inflammation, including interleukin-6, fell. The effect grew with the amount eaten.

Two caveats keep this honest. The trial had 36 participants, all healthy, and it measured blood markers rather than disease. A larger trial in people with a diagnosed condition would be needed to say fermented foods prevent or improve anything clinically. And six servings a day is more than most people will sustain; the study does not tell us whether one daily serving does anything measurable.

Observational studies add supporting texture. Regular yogurt intake has been linked in cohort studies to lower rates of type 2 diabetes, though yogurt eaters tend to have healthier habits overall, which muddies the picture.

Labels matter more than most shoppers realize. Shelf-stable sauerkraut in a can has usually been heat-treated, which kills the microbes; refrigerated versions labeled “raw” or “contains live cultures” have not. Many commercial kombuchas carry more sugar than fermenting benefit. Sourdough is fermented during production, but baking kills the organisms, so it offers a different texture and perhaps easier digestion, not live cultures.

A reasonable, evidence-aligned approach is to add one or two servings daily of foods you actually enjoy, treat them as part of a fiber-rich pattern rather than a standalone fix, and not expect a transformation in a week. The trial took ten.

Do probiotic supplements work for gut health?

Probiotics are live microorganisms, usually bacteria such as Lactobacillus or Bifidobacterium species, taken in amounts intended to confer a health benefit. The word covers thousands of products, and the single most important lesson from the evidence is that strains are not interchangeable. A finding for one strain in one condition says nothing about another strain in another condition, any more than one antibiotic’s results transfer to all antibiotics.

Where do randomized trials show benefit? The NIH Office of Dietary Supplements review finds the most consistent support for reducing the risk of antibiotic-associated diarrhea, shortening some infectious diarrhea in children, and easing symptoms in some people with IBS. Certain strains have trial support for preventing a serious bowel condition in premature infants, a hospital-level decision. Evidence for eczema prevention, weight, mood and immunity ranges from mixed to weak.

For a healthy adult with no symptoms who takes a probiotic hoping for general “gut health,” the trials are small, short and inconsistent, and several show no measurable change in the microbiome at all. Some research suggests supplemental strains pass through without colonizing, which would explain why benefits, when they occur, fade after stopping.

Safety is generally good in healthy people, but the NIH and NHS both flag caution for those who are severely ill, immunocompromised, have a central venous catheter or were born prematurely, because rare bloodstream infections have been reported. In the United States, probiotics sold as supplements are regulated as foods, not drugs, so label claims have not been evaluated the way a medicine’s would be.

Whether a probiotic makes sense for a particular person, which strain, and for how long is a decision for the treating clinician, especially for anyone with an existing diagnosis or on regular medication.

What damages the gut microbiome?

The microbiome is resilient, but not indestructible, and a few exposures reliably knock it down.

Antibiotics are the clearest. They are life-saving when needed and indiscriminate by design; a single course can reduce bacterial diversity for weeks to months, and some species may not return. The CDC estimates that a substantial share of outpatient antibiotic prescriptions in the United States are unnecessary, most often for viral infections such as colds and bronchitis that antibiotics cannot treat. The practical lesson is not to avoid antibiotics when a clinician prescribes them, and never to stop a prescribed course early, but to accept “this is viral, it will pass” as a legitimate answer rather than pushing for a prescription.

Ultra-processed foods, meaning industrial formulations high in refined starches, added sugars, emulsifiers and additives with little intact plant matter, feed the human but starve the microbes. Observational cohorts consistently associate heavy intake with worse cardiometabolic outcomes, and small trials suggest some emulsifiers and artificial sweeteners alter microbial composition, though human data on sweeteners remain mixed.

Heavy alcohol use damages the intestinal lining and shifts the balance toward inflammation-promoting species; moderate intake shows a less consistent signal. Chronic poor sleep and sustained stress alter gut motility and, in small studies, microbial composition. Very low-fiber diets, including some restrictive eating patterns adopted for weight loss, shrink the fermenting population within days.

Long-term use of certain acid-suppressing medicines has been associated in observational studies with changes in gut bacteria and a higher risk of C. difficile infection. That is a reason to review ongoing use with the prescriber at a routine visit, never a reason to stop a medicine on one’s own.

How sleep, exercise and stress shape the gut-brain axis

The gut-brain axis is the two-way communication network linking the digestive tract and the central nervous system through the vagus nerve, hormones and immune signals. It explains why anxiety produces butterflies and why a rough stomach sours a mood. Harvard Health describes the gut as sensitive to emotion in much the way the face is: it flushes, tightens and unsettles.

Where the microbiome fits is more tentative. Gut bacteria produce compounds that resemble neurotransmitters, and in animal studies transferring microbes from anxious mice to calm ones changes behavior. Human trials of probiotics for mood are small and mixed. The honest summary: the gut-brain connection is well established; the microbiome’s role in it is an active research question, not a settled fact.

Exercise has firmer footing. Moderate aerobic activity speeds intestinal transit, which helps constipation, and a handful of small trials show that several weeks of regular exercise increase butyrate-producing bacteria in previously sedentary adults, with the effect reversing when they stop. The American Heart Association’s target of 150 minutes a week of moderate activity is the same figure that appears in gut studies, which is convenient.

Sleep restriction, even two nights of it in one small crossover study, altered microbial composition and reduced insulin sensitivity. Chronic stress raises cortisol, speeds or slows motility depending on the person, and worsens IBS symptoms in trial after trial. Cognitive behavioral therapy and gut-directed hypnotherapy have randomized-trial support for IBS, a striking demonstration that treating the brain can calm the gut.

None of this requires a product. It asks for the same seven to nine hours of sleep, regular movement and stress management that every other organ system has been requesting.

What is a 7-day gut reset, and do you need to detox your gut?

A “7-day gut reset” is a marketing structure, not a medical protocol. The versions circulating online share a template: eliminate sugar, alcohol, dairy, gluten and processed food; drink particular teas or broths; take a probiotic or “cleanse” supplement; and expect a flatter stomach, clearer skin and brighter mood by day seven. Some are harmless. None have been tested in a randomized trial against simply eating more vegetables.

The timeline is the first problem. Microbial composition does shift within days of a dietary change, which is partly why people feel different quickly, though mostly because they have cut out things that cause gas. But the Stanford trial needed ten weeks to show a diversity change, and observational studies suggest a durable microbiome reflects years of habit. A week can start a pattern; it cannot complete one.

“Detoxing the gut” misunderstands the anatomy. The liver and kidneys handle detoxification; the colon absorbs water and salts and houses microbes. Colon cleanses, laxative teas and “parasite cleanses” flush out stool, water and, ironically, the bacteria the person hoped to nurture. Colonic irrigation has no evidence of benefit in healthy people and carries documented risks including electrolyte disturbance and, rarely, bowel perforation.

Elimination diets do have a legitimate clinical use, notably the low-FODMAP diet for IBS, in which fermentable carbohydrates are removed and then systematically reintroduced under dietitian guidance. That is a diagnostic tool with an exit strategy, not an indefinite lifestyle, and it tends to lower microbial diversity while in use, which is exactly why it is not advised for healthy people.

What a week can genuinely do is build momentum: add a serving of beans, swap white bread for whole grain, try kefir, walk after dinner. Keep those, and the “reset” becomes a life.

How to improve gut health: strategies compared by evidence strength

Search results rank interventions by popularity. The table below ranks them by evidence, which produces a different list. “Strong” means multiple randomized trials or very large, consistent cohorts; “moderate” means at least one good trial or consistent observational data; “weak” means small, mixed or indirect studies; “none” means no human trials.

Strategy	Evidence type	Strength	What it actually shows
More dietary fiber (about 25–30 g/day)	RCTs, large cohorts	Strong	Better bowel function, lower LDL, lower colorectal cancer and diabetes risk
Plant diversity (~30 types/week)	Observational	Moderate	Greater microbial diversity; cause not proven
Fermented foods daily	One RCT, cohorts	Moderate	Higher diversity, lower inflammatory markers over 10 weeks
Probiotics for a specific condition	RCTs	Moderate	Less antibiotic-associated diarrhea; some IBS relief with particular strains
Probiotics for general wellness	Small RCTs	Weak	Inconsistent; often no microbiome change
Limiting ultra-processed food	Cohorts, small trials	Moderate	Better metabolic outcomes; microbiome mechanism plausible
Regular exercise	Small RCTs	Moderate	Faster transit, more butyrate producers; reverses on stopping
Sleep and stress management	Small trials, IBS RCTs	Moderate for IBS	Symptom improvement; microbiome effect uncertain
7-day resets, detox teas, colon cleanses	None	None	No trials; cleanses may deplete microbes
Consumer microbiome test kits	None for guidance	None	Descriptive only; no validated dietary prescriptions

Two things stand out. Nothing in the strong tier comes in a capsule, and nothing in the bottom tier is free. The table also shows why “gut health” advice frustrates clinicians: the same phrase describes a cohort-backed dietary pattern and an untested cleanse, and packaging gives the reader no way to tell them apart. Grading is the only fix.

Common myths about gut health, corrected

A few claims travel so widely they deserve individual correction.

“Everyone should take a daily probiotic.” Trials do not support this for healthy adults. Benefits are strain- and condition-specific, and many supplemental strains do not persist in the gut. Whether one is appropriate is a question for a clinician, not a default.

“A stool test can give you a personalized gut diet.” Consumer kits can list which bacteria are present. No test has been validated to translate that list into dietary prescriptions that improve outcomes, and healthy microbiomes vary so much that “abnormal” has no agreed definition.

“Bloating means your gut is unhealthy.” Bloating after a large meal, beans or carbonated drinks is normal fermentation. Persistent, worsening or painful bloating is a symptom to evaluate, but it points to many conditions, not a single “unhealthy gut.”

“Gluten and dairy harm everyone’s gut.” Celiac disease and lactose intolerance are real and testable. In people without them, randomized trials do not show that removing gluten or dairy improves the microbiome, and cutting whole grains and yogurt removes two well-studied sources of fiber and live cultures.

“Apple cider vinegar or bone broth heals the gut lining.” Increased intestinal permeability, popularly called “leaky gut,” is a measurable research phenomenon in certain diseases, but no evidence shows these foods repair it in healthy people, and no accepted test diagnoses it outside research.

“Antibiotics ruin your gut forever.” Diversity typically recovers over weeks to months, especially on a fiber-rich diet. Some species may be lost, which is a reason to use antibiotics only when prescribed, never a reason to refuse treatment for a bacterial infection.

“Fiber supplements are as good as fiber foods.” Psyllium has solid trial support for constipation and cholesterol, but one isolated fiber feeds a narrow set of microbes. Whole plants deliver dozens of fiber types plus polyphenols, plant compounds that gut bacteria also metabolize.

Microbiome tests, fecal transplants and what is still investigational

Two products sit at opposite ends of the regulatory spectrum, and the distance between them is the whole story.

Direct-to-consumer microbiome tests, in which a stool sample is mailed off and sequenced, are sold as wellness products, not medical devices, and are not intended to diagnose anything. They can accurately report which bacterial groups are present and in what proportions. What they cannot do is tell a healthy person whether that profile is good or bad, because no validated reference range exists, and they cannot generate a diet shown in trials to improve health. Results shift day to day with diet, sleep and even which part of the sample was scooped. Clinicians generally regard them as interesting and clinically unactionable.

Fecal microbiota transplantation (FMT), the transfer of processed stool from a screened donor into a patient’s colon, is the other pole. It has strong randomized-trial support for one indication: recurrent C. difficile infection that has not responded to antibiotics, where it succeeds in the large majority of cases. Two standardized, FDA-approved microbiota products for that indication now exist, prescribed by gastroenterologists in clinical settings. For every other use, including IBS, inflammatory bowel disease, obesity and autism, FMT remains investigational, meaning it is being studied in registered trials and is not approved for those conditions. Do-it-yourself FMT, described in some online communities, carries real infection risk, has caused documented serious harm, and is not for self-use under any circumstances.

Between those poles sit supplements marketed as “postbiotics” (microbial metabolites), “synbiotics” (probiotic plus prebiotic combinations) and various “gut-lining repair” formulas. A few contain ingredients with early trial data; most have none for the specific product. In the United States, none require pre-market proof of efficacy.

The rule of thumb holds: the more targeted the claim and the more it resembles a medical treatment, the more it belongs in a clinician’s hands.

When to see a doctor about gut symptoms

Most gut complaints are benign and self-limiting, and most of this article has argued for patience and vegetables. There are exceptions, and they should not wait for a reset to finish.

Seek same-day or emergency care for:

• Blood in stool, black or tarry stool, or vomiting blood
• Severe or worsening abdominal pain, especially with fever, a rigid abdomen or inability to pass gas
• Persistent vomiting with signs of dehydration such as dizziness, very dark urine or no urination for many hours
• Diarrhea with high fever, or diarrhea lasting more than two days in an adult who cannot keep fluids down
• Difficulty swallowing or food sticking in the chest

Book a routine appointment for:

• A change in bowel habit lasting more than three weeks
• Unintended weight loss
• Bloating that is constant, progressive or new after age 50
• Ongoing heartburn or nausea without an obvious cause
• Digestive symptoms alongside fatigue, pale skin or breathlessness, which can signal iron deficiency
• Symptoms that began after travel or a course of antibiotics and have not settled
• A family history of colorectal cancer, celiac disease or inflammatory bowel disease

Screening deserves its own line. In the United States, colorectal cancer screening is recommended for adults at average risk beginning at age 45, and earlier for those with a family history or certain conditions; the right test and interval is a decision to make with a clinician.

Anyone considering a probiotic, prebiotic or major dietary overhaul who is pregnant, immunocompromised, recovering from surgery, living with a chronic condition or taking regular medicines should discuss it with their prescribing clinician first. Never stop or change a prescribed medicine, including acid suppressants or antibiotics, because of gut-health content. The clinician who knows the whole picture is the one who should make that call.

Frequently asked questions

What is a 7 day gut reset?

A 7-day gut reset is a marketing template, not a medical protocol: a week of cutting sugar, alcohol, dairy, gluten and processed food, often paired with teas or supplements. No randomized trial has tested one against simply eating more vegetables. People often feel less bloated within days because gas-producing foods are removed, but the one trial showing microbiome diversity changes from diet took ten weeks.

What are the 7 signs of an unhealthy gut?

There is no medically validated list of seven signs. Genuine digestive symptoms worth attention include bloating that is constant or worsening, persistent gas, constipation or diarrhea lasting more than a few weeks, abdominal pain, frequent heartburn and unintended weight change. Fatigue, acne and sugar cravings, which appear on viral lists, have many causes and are not specific to the gut.

How do I detox my gut?

You do not need to. The liver and kidneys perform detoxification; the colon absorbs water and houses microbes. Cleanses, laxative teas and colonic irrigation flush out stool, fluid and beneficial bacteria, and irrigation carries documented risks including electrolyte disturbance. The evidence-supported way to support the colon is more fiber, more plant variety, fermented foods and less ultra-processed food, sustained over months.

How can I improve my gut health naturally without supplements?

Eat more fiber from a wide range of plants, aiming toward about 30 grams a day and 30 different plant types a week; add a daily serving of live-culture fermented food such as yogurt, kefir or kimchi; limit ultra-processed food and heavy alcohol; exercise regularly; and protect sleep. Each of these has stronger trial or cohort evidence than any general-wellness supplement.

How long does it take to improve gut health?

Microbial composition begins shifting within a few days of a dietary change, but meaningful, durable improvement takes longer. The Stanford fermented-food trial showed rising diversity over ten weeks, exercise studies show changes after about six weeks that reverse when people stop, and observational data suggest a stable microbiome reflects years of habit. Think in months, not days.

Should I take a probiotic after antibiotics?

Randomized trials show certain probiotic strains can reduce the risk of antibiotic-associated diarrhea, which is one of the better-supported uses. Evidence that they speed overall microbiome recovery is weaker, and a fiber-rich diet appears to help the community rebound. Whether a probiotic is appropriate, and which strain, depends on the person and the antibiotic, so ask the prescribing clinician.

Is kombucha good for gut health?

Kombucha is a fermented tea that can contain live cultures, but it has not been tested in a dedicated human trial, and many commercial versions contain substantial added sugar. It counted among the fermented foods in the Stanford trial, though yogurt, kefir and vegetable ferments were also included. Treat it as an occasional option, not a proven therapy, and check the sugar content.

Can a microbiome test tell me what to eat?

Not reliably. Consumer stool tests can list which bacterial groups are present, but no test has been validated to turn that profile into a diet shown in trials to improve health outcomes. Healthy microbiomes vary widely, results change day to day, and there is no agreed reference range for normal. The dietary advice that follows is usually generic fiber and plant guidance you could follow without a kit.

What are the best foods for gut health?

Beans and lentils, oats, whole grains, nuts, seeds, a wide variety of vegetables and fruits, and onions, garlic and leeks for prebiotic fibers, plus live-culture fermented foods such as plain yogurt, kefir, kimchi and refrigerated sauerkraut. Variety matters as much as any single food, because different fibers feed different microbes. Heavily processed foods high in refined starch and added sugar do the opposite.

Can stress cause gut problems?

Yes, through the gut-brain axis, the two-way signaling network between the digestive tract and nervous system. Stress alters gut motility and worsens symptoms in irritable bowel syndrome in trial after trial, and cognitive behavioral therapy and gut-directed hypnotherapy have randomized-trial support for IBS. Whether stress meaningfully changes the microbiome in humans is still an open research question.

References

• How to get more fibre into your diet – NHS
• Gut Microbiome – Cleveland Clinic

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.