What to eat, and why, for a healthier digestive system.
What you eat is the single most powerful lever you have over your gut microbiome. This isn't a subtle influence: dietary changes can shift your bacterial populations in as little as 24-48 hours. Eat a fiber-rich plant-based meal and your SCFA-producing bacteria bloom within a day. Switch to a low-fiber, high-sugar diet and those same populations decline just as fast.
Food affects your microbiome through three primary mechanisms:
The 25 foods on this list represent the strongest evidence across all three mechanisms. We've organized them by category and included the specific reason each food helps, how much to eat, and practical tips for working them into real meals, not theoretical ones.
For the broader picture of how your microbiome works, see our microbiome explained guide. For the distinction between probiotics and prebiotics, see our probiotics vs. prebiotics guide.
Fermented foods are the most direct way to introduce beneficial microorganisms into your gut. The 2021 Stanford study (published in Cell) is the landmark reference here: participants who ate six servings of fermented foods daily for 10 weeks showed significantly increased microbiome diversity and reduced levels of 19 inflammatory proteins. A high-fiber diet didn't achieve the same diversity increase over the same period.
Not all fermented foods are equal. The ones that matter most contain live, active cultures, meaning they haven't been pasteurized after fermentation. Here are the seven with the strongest evidence.
Why it helps: Raw sauerkraut contains diverse Lactobacillus species (L. plantarum, L. brevis, L. sakei) along with Leuconostoc and Pediococcus strains. A single tablespoon can contain millions of colony-forming units of live bacteria. The lactic acid it contains also creates a favorable environment for beneficial bacteria already in your gut.
How much: 1-2 tablespoons daily is sufficient. Start with less if you're new to fermented foods. Your gut needs time to adjust.
Practical tip: Buy from the refrigerated section (shelf-stable sauerkraut has been pasteurized and contains no live bacteria). Or better yet, make your own: it's cabbage, salt, and time. Visit our fermentation guides for step-by-step instructions.
Why it helps: Kimchi delivers the same Lactobacillus benefits as sauerkraut but with added diversity from its additional ingredients: garlic (prebiotic), ginger (anti-inflammatory), and chili peppers (which may promote Akkermansia growth). Korean studies have linked regular kimchi consumption to improved metabolic markers and reduced inflammatory markers.
How much: A few tablespoons daily with meals. It's traditionally eaten as a side dish at every meal in Korean cuisine: small amounts, high frequency.
Practical tip: Look for brands that say "naturally fermented" and are sold refrigerated. Kimchi is also one of the easiest ferments to make at home.
Why it helps: Kefir is arguably the most microbially diverse fermented food available. While yogurt typically contains 2-7 bacterial strains, kefir contains 30-50+ strains of bacteria and yeast. The fermentation process also breaks down most of the lactose, making it tolerable for many people with lactose intolerance.
How much: 1 cup (240ml) daily. Kefir made from kefir grains is more diverse than commercial kefir made with powdered starter cultures, though both are beneficial.
Practical tip: Water kefir and coconut kefir are solid dairy-free alternatives that still provide bacterial diversity, though the specific strains differ from dairy kefir.
Why it helps: Yogurt's benefits come from its Lactobacillus and Streptococcus thermophilus cultures, which produce lactic acid and may help reduce intestinal permeability. Regular yogurt consumption is consistently associated with better metabolic health markers in observational studies.
How much: 1 cup daily. Choose plain, unsweetened varieties. Flavored yogurts often contain enough sugar to offset the microbial benefits.
Practical tip: Check the label for "live and active cultures." All yogurt is made with bacteria, but some products are heat-treated after fermentation, which kills the organisms. Greek yogurt and regular yogurt are both fine. The straining process for Greek yogurt removes whey but doesn't affect the live cultures.
Why it helps: Miso is fermented with Aspergillus oryzae (a beneficial fungus) and often contains Lactobacillus and Bacillus species. Beyond live cultures, miso provides isoflavones and melanoidins, compounds with antioxidant and anti-inflammatory properties. Longer-fermented (darker) miso varieties are more microbially complex.
How much: 1 tablespoon per serving, a few times weekly. A cup of miso soup is the simplest application.
Practical tip: Don't boil miso. Dissolve it into warm (not boiling) water or broth to preserve the live cultures. Red and brown miso are fermented longer than white miso and contain more complex microbial communities.
Why it helps: Tempeh is whole soybeans fermented with Rhizopus oligosporus. The fermentation makes soy nutrients more bioavailable, breaks down phytic acid (which inhibits mineral absorption), and produces enzymes that aid digestion. Tempeh also contains significant prebiotic fiber from the soybeans themselves.
How much: 3-4 ounces as a protein source, a few times weekly.
Practical tip: Unlike most fermented foods on this list, tempeh is typically cooked before eating. Cooking kills some microorganisms but doesn't destroy the enzymes and metabolites produced during fermentation, which still benefit gut function.
Why it helps: Kombucha is fermented tea containing acetic acid bacteria and yeasts (primarily Saccharomyces and Gluconacetobacter species). It delivers live organisms along with organic acids and polyphenols from the tea base. The evidence for kombucha specifically is less robust than for sauerkraut or kefir, but it does contain live microbial cultures.
How much: 4-8 ounces daily. Watch sugar content: some commercial kombuchas contain as much sugar as soda after flavoring. Choose brands with less than 5g sugar per serving.
Practical tip: Homemade kombucha gives you control over sugar content and fermentation time. If you buy commercial, look for refrigerated brands with minimal added sugar and juice.
The critical distinction: fermented foods must contain live cultures to benefit your microbiome. Shelf-stable sauerkraut, pasteurized pickles, and heat-treated yogurt have been through processing that kills the organisms. Always buy fermented foods from the refrigerated section or make your own.
Prebiotics are the other half of the equation. While fermented foods introduce new bacteria, prebiotic foods feed the beneficial bacteria already living in your gut. They do this by providing specific types of fiber (primarily inulin, fructo-oligosaccharides (FOS), and resistant starch) that resist digestion in your small intestine and arrive intact in your colon, where bacteria ferment them into short-chain fatty acids.
Butyrate, the most important of these short-chain fatty acids, is the primary fuel source for colonocytes (the cells lining your colon). Without adequate butyrate, these cells weaken, the gut barrier becomes more permeable, and inflammation increases. Eating prebiotic foods is, quite literally, feeding the cells that maintain your gut wall.
Why it helps: Garlic is one of the richest sources of inulin and fructo-oligosaccharides (FOS). It specifically promotes the growth of Bifidobacterium species in the colon. Garlic also contains allicin, a compound with antimicrobial properties that selectively inhibits pathogenic bacteria while leaving beneficial species relatively unaffected.
How much: 2-3 cloves daily. Raw garlic retains more allicin, but cooked garlic still provides prebiotic fiber. The inulin survives cooking; the allicin partially breaks down.
Practical tip: Crush or chop garlic and let it sit for 10 minutes before cooking. This activates the enzyme alliinase, which converts alliin to allicin. Cooking immediately after cutting reduces allicin formation.
Why it helps: Onions contain prebiotic fructans (inulin and FOS), typically around 1-6g per 100g fresh weight depending on variety. Raw onions have the highest prebiotic content, but cooked onions retain most of it. Like garlic, onions selectively feed Bifidobacterium and Lactobacillus species.
How much: Half a medium onion daily (cooked or raw) provides meaningful prebiotic fiber. They're one of the easiest prebiotics to consume regularly because they're a base ingredient in so many dishes.
Practical tip: If raw onions cause digestive discomfort, cooked onions are a perfectly good alternative. Slow-cooked caramelized onions still contain their prebiotic fiber. The fiber isn't destroyed by heat.
Why it helps: Leeks belong to the same allium family as garlic and onions and are similarly rich in inulin. They're milder in flavor, which makes them a good option for people who find garlic or onions too intense.
How much: One medium leek contains about 1.6g of prebiotic fiber. Use them as you would onions, in soups, stir-fries, or roasted as a side dish.
Practical tip: Don't discard the dark green tops. They're tougher but contain prebiotic fiber and are excellent in stocks and soups where they'll soften.
Why it helps: Asparagus contains about 2-3% inulin by weight and is one of the best vegetable sources of prebiotic fiber. It also provides glutathione, a potent antioxidant that supports gut lining repair.
How much: A serving of 5-6 spears a few times weekly provides meaningful prebiotic fiber alongside folate, vitamins A, C, and K.
Practical tip: Both cooked and raw asparagus provide prebiotic fiber. Roasting, steaming, or grilling are all fine. The inulin survives cooking.
Why it helps: Green and slightly underripe bananas are one of the best food sources of resistant starch, a type of prebiotic that bacteria ferment into butyrate. As bananas ripen, the resistant starch converts to simple sugars, so greener is better for prebiotic purposes. Even ripe bananas still contain FOS, just less resistant starch.
How much: One banana daily. If you're specifically targeting resistant starch, choose bananas that are still slightly firm with a touch of green at the tips.
Practical tip: Frozen green bananas blended into smoothies are an easy way to get resistant starch without the less-sweet taste that puts some people off.
Why it helps: Jerusalem artichokes are the single richest common food source of inulin, with up to 76% of their dry weight as inulin fiber. They're powerfully prebiotic, which means they produce a lot of gas as bacteria ferment them. Start small.
How much: Start with 1-2 ounces and work up. Seriously: jumping straight to a full serving of sunchokes when your gut isn't adapted is a reliable way to experience spectacular bloating.
Practical tip: Roast them like potatoes. The flavor is nutty and slightly sweet. Peel them or scrub well. The skin is thin and edible. Introduce them gradually over two weeks to let your bacteria populations adjust.
Why it helps: Oats contain beta-glucan, a soluble fiber that feeds Bifidobacterium and Lactobacillus species and increases butyrate production. Beta-glucan has also been shown to reduce LDL cholesterol and improve insulin sensitivity, benefits partially mediated through microbiome changes.
How much: Half a cup of rolled oats daily (as porridge, overnight oats, or in baking) provides about 2g of beta-glucan, the amount used in most clinical studies.
Practical tip: Steel-cut and rolled oats have similar beta-glucan content. Instant oats have slightly less fiber due to processing but still provide prebiotic benefit. Overnight oats also develop resistant starch as they cool.
If you're new to high-prebiotic foods, increase gradually over 2-3 weeks. The temporary bloating and gas that many people experience when adding fiber isn't a sign that something is wrong. It's a sign that your bacteria are actively fermenting the fiber. Your gut adjusts as bacterial populations shift.
Polyphenols are plant compounds with antioxidant properties, but their gut health benefits extend far beyond antioxidation. About 90-95% of dietary polyphenols pass through your small intestine unabsorbed and reach your colon, where gut bacteria metabolize them into bioactive compounds. In return, polyphenols selectively promote beneficial bacteria (particularly Akkermansia, Bifidobacterium, and Lactobacillus) while inhibiting pathogenic species.
This two-way relationship, where polyphenols feed bacteria that then convert polyphenols into more potent metabolites, is one of the more elegant examples of how your diet and microbiome interact.
Why they help: Berries are among the most polyphenol-dense foods available. Blueberries in particular have been shown to increase Bifidobacterium and Akkermansia populations in human studies. The anthocyanins (the compounds that give berries their color) are poorly absorbed in the small intestine, meaning most reach the colon where they interact with gut bacteria.
How much: 1 cup of mixed berries daily. Frozen berries retain their polyphenol content and are more affordable year-round.
Practical tip: Mix berry types for broader polyphenol coverage. Blueberries are highest in anthocyanins, raspberries are highest in ellagitannins, and blackberries provide both. Frozen and fresh are nutritionally equivalent for gut health purposes.
Why it helps: Cacao is one of the richest food sources of flavanols, a subclass of polyphenols. When gut bacteria metabolize cacao flavanols, they produce anti-inflammatory compounds and short-chain fatty acids. Studies have shown that regular dark chocolate consumption increases Lactobacillus and Bifidobacterium populations.
How much: 1-2 ounces (30-60g) of 70%+ dark chocolate daily. The cacao percentage matters. Milk chocolate has too little cacao and too much sugar to provide meaningful benefit.
Practical tip: The higher the cacao percentage, the more polyphenols but also the more bitter the taste. 70-80% is the sweet spot for most people: enough cacao for real benefit, palatable enough to eat consistently.
Why it helps: Green tea contains catechins, particularly epigallocatechin gallate (EGCG), which are metabolized by gut bacteria and have been shown to increase Akkermansia muciniphila and Bifidobacterium populations. Green tea catechins also inhibit the growth of pathogenic bacteria including Clostridium perfringens and Helicobacter pylori.
How much: 2-3 cups daily. Brewing time matters: steep for 3-5 minutes to extract meaningful catechins. Quick dunking produces a pleasant drink but extracts far less.
Practical tip: Matcha is essentially concentrated green tea and contains higher catechin levels per serving. If you enjoy it, matcha is an efficient way to get green tea polyphenols.
Why it helps: Extra virgin olive oil (EVOO) contains oleocanthal and hydroxytyrosol, polyphenols with anti-inflammatory properties that promote Lactobacillus and Bifidobacterium growth. EVOO has also been associated with increased Akkermansia levels. The monounsaturated fats in olive oil additionally support bile acid production, which influences microbiome composition.
How much: 2 tablespoons daily as your primary cooking and finishing oil. Use it raw on salads, drizzled over vegetables, or for low-to-medium-heat cooking.
Practical tip: Quality matters here more than with most foods. True extra virgin olive oil (cold-pressed, unrefined) contains significantly more polyphenols than refined olive oil or "light" olive oil. Look for harvest dates on bottles: the fresher, the higher the polyphenol content.
Chronic low-grade gut inflammation disrupts the microbiome, weakens the gut barrier, and creates a feedback loop that's hard to break. These foods help interrupt that cycle through direct anti-inflammatory mechanisms.
Why it helps: Curcumin, the active compound in turmeric, has well-documented anti-inflammatory effects. In the gut specifically, curcumin reduces inflammatory cytokines, supports gut barrier integrity, and modulates microbiome composition. A 2020 systematic review found that curcumin supplementation increased Bifidobacterium and Lactobacillus populations while reducing markers of intestinal inflammation.
How much: 1 teaspoon of turmeric powder daily or a 1-inch piece of fresh turmeric. Curcumin is poorly absorbed alone. Pairing it with black pepper (which contains piperine) increases absorption by up to 2,000%.
Practical tip: Golden milk, curry dishes, and turmeric-spiced soups are all practical delivery methods. The traditional combination of turmeric with black pepper and fat (common in Indian cooking) is ideal for absorption. Don't rely on supplements when the spice itself works so well in food.
Why it helps: Ginger contains gingerols and shogaols, compounds that reduce intestinal inflammation, accelerate gastric emptying, and have been shown to positively influence microbiome composition. Ginger is one of the best-studied natural remedies for nausea, and its gut-calming effects extend to reducing bloating and supporting motility.
How much: 1-2 inches of fresh ginger daily (grated into dishes, brewed as tea, or added to smoothies). Dried ground ginger works too, at about 1/2 to 1 teaspoon.
Practical tip: Ginger tea is the simplest daily application: slice fresh ginger into hot water and steep for 10 minutes. It's also a natural partner for fermented foods: fresh ginger is a traditional ingredient in kombucha, kimchi, and many fermented condiments.
Why it helps: Bone broth provides glutamine, the preferred fuel source for the cells lining your small intestine (enterocytes). It also supplies collagen-derived amino acids (glycine, proline) that support gut barrier repair. While the clinical evidence specifically for bone broth is limited, the individual amino acids it contains have solid evidence for gut barrier support.
How much: 1 cup daily during periods of gut healing or as a regular part of your cooking routine. Use it as a base for soups, grains, and sauces.
Practical tip: Long-simmered bone broth (12-24 hours for beef bones, 8-12 for chicken) extracts the most collagen and minerals. If making your own isn't practical, choose commercial brands that gel when refrigerated, which indicates adequate collagen extraction.
Why it helps: Omega-3 fatty acids (EPA and DHA) in fatty fish reduce gut inflammation through multiple mechanisms: they increase anti-inflammatory compounds called resolvins, reduce inflammatory cytokines, and have been shown to increase Bifidobacterium, Lactobacillus, and butyrate-producing bacterial species. Research has linked higher omega-3 intake with shifts in microbiome composition, including greater relative abundance of Bifidobacterium, Lactobacillus, and butyrate-producing species.
How much: Two to three 4-ounce servings of fatty fish per week. Salmon, sardines, mackerel, herring, and anchovies are the best sources.
Practical tip: Canned sardines and mackerel are affordable, shelf-stable, and nutritionally identical to fresh. They're one of the most underrated gut health foods: high in omega-3s, low in mercury, and eaten bones-and-all for additional calcium.
Why they help: Apples are the best common food source of pectin, a soluble fiber that gut bacteria ferment into butyrate and propionate. A medium apple provides about 4.4g of fiber, roughly half of which is pectin. Studies have shown that apple pectin specifically increases Bifidobacterium populations and reduces populations of pathogenic Clostridium species.
How much: One apple daily. Eat the skin. It contains most of the pectin and polyphenols. Different apple varieties have slightly different pectin contents, but all provide meaningful amounts.
Practical tip: Cooked apples (baked, stewed) retain their pectin and may actually be easier to digest for people with sensitive guts. Applesauce (unsweetened, with no additives) is a concentrated pectin source.
Why they help: Flaxseeds provide both soluble and insoluble fiber, along with alpha-linolenic acid (plant-based omega-3). The soluble fiber in flaxseeds forms a gel-like substance that supports gut motility and feeds beneficial bacteria. Flaxseeds are also the richest dietary source of lignans, plant compounds that gut bacteria convert into enterolactone and enterodiol, which have anti-inflammatory and potentially cancer-protective properties.
How much: 1-2 tablespoons of ground flaxseed daily. Whole flaxseeds pass through largely intact. Grinding is essential for accessing the fiber and nutrients inside.
Practical tip: Buy whole flaxseeds and grind them yourself in a coffee grinder or blender. Pre-ground flaxseed oxidizes quickly and can go rancid. Store ground flaxseed in the freezer. Add it to smoothies, oatmeal, yogurt, or baked goods.
Why they help: Almonds are a solid source of prebiotic fiber: their cell walls contain compounds that resist digestion in the small intestine and are fermented by colonic bacteria, increasing Bifidobacterium and Lactobacillus populations. Studies show that regular almond consumption increases populations of beneficial bacteria including Bifidobacterium and Lactobacillus, with more recent trials also finding increased butyrate production.
How much: A handful (about 1 ounce or 23 almonds) daily.
Practical tip: Almond skins contain most of the prebiotic fiber and polyphenols, so choose whole almonds over blanched (skinless). Raw and dry-roasted are both fine. The prebiotic fiber survives roasting.
Don't try to eat all 25 foods daily. That's not the point. Pick 8-10 that you genuinely like and can eat consistently, then rotate in others over time. A serving of sauerkraut, a cup of oatmeal, garlic and onions in your cooking, berries in your breakfast, and olive oil on your salad covers five categories with almost no effort.
Lists of individual foods are useful for understanding why specific foods help. But real eating is about meals, not ingredients. Here's what a day of gut-friendly eating actually looks like, not as a rigid meal plan, but as an illustration of how these 25 foods fit naturally into normal cooking.
Overnight oats (#14) made with kefir (#3) instead of milk, topped with mixed berries (#15), ground flaxseed (#24), and a drizzle of raw honey. This single meal delivers prebiotic fiber (oats), live bacterial cultures (kefir), polyphenols (berries), and omega-3s plus lignans (flaxseed). Four gut-supporting categories before 9 AM.
A grain bowl with roasted vegetables, a scoop of kimchi (#2) or sauerkraut (#1) on the side, dressed with extra virgin olive oil (#18) and lemon. Add any protein you like. The fermented side dish delivers live cultures, and the olive oil provides polyphenols.
An apple (#23) with a small handful of almonds (#25), or a square or two of dark chocolate (#16) with green tea (#17).
Almost any home-cooked meal built on a base of garlic (#8) and onions (#9), which covers the vast majority of savory cooking worldwide, with a generous portion of vegetables. A simple example: salmon (#22) with roasted asparagus (#11) and a turmeric-ginger (#19, #20) rice or soup. A tablespoon of miso (#5) stirred into the broth if you're making soup.
That's 14 of the 25 foods in a normal day of eating that doesn't feel like a medical protocol. And crucially, it's built from real cooking patterns, not bizarre combinations designed to hit a nutrient checklist.
Remember the American Gut Project finding: people who eat 30 or more different plant species per week have significantly more diverse microbiomes than those who eat fewer than 10. Use this as your North Star rather than fixating on any single food. Herbs, spices, nuts, and seeds all count as individual species. If your dinner contains garlic, onion, pepper, cumin, olive oil, rice, broccoli, and carrots. That's eight species in one meal.
For a structured approach to building gut-friendly eating habits, including a week-by-week plan, see our gut health diet plan.
You knew this section was coming. While the emphasis should be on what to add rather than what to remove, certain foods actively work against your microbiome when consumed in excess.
Ultra-processed foods: These dominate the typical Western diet, accounting for 60% of calories in American and British diets. They're typically low in fiber (starving beneficial bacteria), high in sugar and refined carbs (feeding less desirable organisms), and contain emulsifiers and additives that may directly damage the gut lining.
Artificial sweeteners: Saccharin, sucralose, and aspartame have all been shown to alter gut microbiome composition in human and animal studies. A 2022 Cell study found that saccharin, sucralose, aspartame, and stevia each altered gut microbiome composition, with saccharin and sucralose having the most pronounced effects on glucose tolerance.
Excess alcohol: Moderate alcohol consumption (especially red wine, which contains polyphenols) may not harm the microbiome significantly. But regular heavy drinking disrupts the gut barrier, reduces beneficial bacteria, and promotes the growth of pro-inflammatory species. If you drink, moderation is genuinely important for gut health.
Excess refined sugar: High sugar intake promotes the overgrowth of less desirable organisms, including Candida yeasts and certain pathogenic bacteria, while reducing populations of beneficial fiber-fermenting species.
The practical takeaway isn't to eliminate all of these perfectly. It's to notice the ratio. If 80% of your diet comes from whole, minimally processed foods with diverse plants, fermented foods, and good fats, the other 20% isn't going to wreck your microbiome. The problems arise when those ratios flip.
It depends on how they're made. Naturally fermented pickles (made with salt brine and no vinegar) contain live Lactobacillus bacteria and are genuinely beneficial for gut health. However, most store-bought pickles are made with vinegar. They're preserved but not fermented and contain no live cultures. Check the label: if it lists vinegar as an ingredient, it's not fermented. Look for pickles in the refrigerated section that list only cucumbers, water, salt, and spices. Or make your own lacto-fermented pickles at home.
Kombucha does contain live bacteria and yeasts, organic acids, and polyphenols from the tea base, all of which can support gut health. However, the evidence specifically for kombucha is less robust than for foods like sauerkraut, kefir, or yogurt. The main concern with commercial kombucha is sugar: some brands contain as much as a can of soda. Choose brands with less than 5g sugar per serving, or better yet, brew your own. Kombucha is a reasonable addition to a gut-friendly diet, but it shouldn't be your only fermented food.
The best yogurt for gut health is plain, unsweetened yogurt that contains live and active cultures. The specific brand matters less than those two criteria. Greek yogurt and regular yogurt both contain live cultures; the straining process for Greek removes whey but doesn't affect the bacteria. Avoid flavored yogurts with added sugar, which can offset the microbial benefits. If you tolerate dairy, full-fat yogurt may be slightly better because fat slows gastric transit, giving bacteria more time to survive through stomach acid. For dairy-free options, look for coconut or almond yogurt with added live cultures.
Yes, oatmeal is excellent for gut health. Oats contain beta-glucan, a soluble prebiotic fiber that feeds Bifidobacterium and Lactobacillus species and increases butyrate production in the colon. About half a cup of oats daily provides the 2-3g of beta-glucan used in most clinical studies. Steel-cut, rolled, and even instant oats all provide beta-glucan, though less-processed versions have slightly more. Overnight oats are a particularly good option because cooling cooked oats creates resistant starch, an additional type of prebiotic fiber.
The American Gut Project, one of the largest studies of the human microbiome, found that people who ate 30 or more different plant species per week had significantly more diverse microbiomes than those who ate 10 or fewer. This counts all plant foods: vegetables, fruits, grains, legumes, nuts, seeds, herbs, and spices. Each counts as one species. A well-seasoned stir-fry with five vegetables, rice, sesame seeds, garlic, and ginger gets you to nine species in a single meal. The 30-species target is more achievable than it sounds.
For most people, yes. A serving of homemade sauerkraut contains hundreds of bacterial species, far more diverse than any probiotic supplement, which typically contains 1-15 strains. Regular consumption of fermented foods like sauerkraut, kimchi, kefir, yogurt, and miso provides a broad spectrum of live organisms along with the organic acids and metabolites they produce. Supplements can be useful in specific situations (after antibiotics, for certain digestive conditions, or when fermented foods aren't accessible), but food-based approaches are generally more effective for long-term microbiome support.
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