The bacteria in your gut aren't one thing — they're a whole community, and a varied one tends to be a healthier one. This is a plain-English blog about the foods that feed that variety: many kinds of fiber, plants rich in polyphenols, and a steady habit of fermented foods.
A gut microbiome is less like a single organ and more like a crowded, competitive neighbourhood.
Microbiome Menu is a food-first blog about the trillions of bacteria living in your large intestine and what they eat. Different microbes prefer different fibers, so the more kinds of plant you rotate through, the more of that community you support. Those bacteria ferment fiber into helpful compounds, nudge your immune system, and are tangled up with how you feel day to day.
We don't sell powders, promise cures, or invent numbers. Each article takes one honest question — a fiber family, a group of polyphenol-rich foods, or a fermentation habit — and answers it in language you can act on at your next meal.
One fiber powder feeds a narrow slice of your gut. Thirty different plants across a week feed far more of it. Here's why variety, not volume, is the thing that actually moves the needle on a diverse microbiome.
Read the article →Each one takes a single, practical question about eating for a diverse microbiome and answers it without gimmicks or invented statistics.
Different microbes eat different fibers. Why a wide, rotating plate does more than any one powder.
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The colourful compounds in berries, tea and cocoa mostly reach your gut intact — and your bacteria go to work on them.
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A little, often, beats a big jar once a month. A calm, no-numbers look at building a fermented habit.
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Ultra-processed diets, endless snacking and skipping plants all narrow the community. The ones worth easing off.
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Holidays, illness, a hard month — your gut is resilient. How to bring the variety back, gently.
Read →Resistant starch, the fibre-gut-mood link, and eating for diversity on a budget are next on the bench.
No single food carries every kind of fiber, and different microbes prefer different ones. The trick isn't one hero food — it's touching several of these families across a week.
Long-chain prebiotic fibers that feed some of the best-known beneficial bacteria. Rich, and worth introducing gently if you're not used to them.
A soluble, gel-forming fiber that ferments well in the gut and is linked with steadier blood sugar and cholesterol. Easy to fold into breakfast.
Starch that resists digestion and reaches the gut whole — often more of it once starchy foods have been cooked and then cooled.
Soft, soluble fibers from fruit skins, pith and pulses that many gut bacteria happily ferment. A broad, everyday base to build on.
There's no magic dose, and we won't pretend there is. What tends to help is little and often rather than a rare large helping. Use these cadences as a loose guide, not a prescription — start low, build up, and let your gut set the pace.
A forkful of sauerkraut or kimchi with a meal, or a small pot of live yogurt or kefir. Small amounts, made routine, are gentler on your system than an occasional big serving.
Different ferments carry different microbes and flavours, so vary what you reach for across the week rather than leaning on one jar. Variety here mirrors the variety you want on the plate.
New to fermented foods? Begin with a small amount and see how you feel over a week or two before adding more. Some people notice a little wind at first as the gut adjusts; it usually settles.
Honest caveat: "fermented" only counts if the food still contains live cultures — heat-treated or shelf-stable versions (many supermarket pickles, most bottled kombucha-flavoured drinks) may not. Look for "live" or "raw" and keep it refrigerated. If you have a medical condition, check with a professional first.
Fiber gets the attention, but the pigments that make berries deep-blue, tea bitter and cocoa dark are prebiotic in their own way. Most polyphenols pass the small intestine largely undigested and reach the gut, where bacteria transform them into compounds your body can use.
Read about polyphenols →It refers to how many different kinds of bacteria live in your gut and how evenly they're balanced. Broadly, a more varied community tends to be associated with better gut and general health, partly because different microbes do different jobs. You can't see your own diversity without a test, but eating a wide range of plants is the most reliable everyday lever most people have.
A figure of around 30 different plants a week gets quoted a lot, and it's a genuinely useful nudge toward variety. Treat it as a direction rather than a rule — herbs, spices, nuts, seeds, wholegrains and different-coloured fruit and veg all count. Nobody needs to tally it forever; the point is to keep reaching for something new instead of the same three vegetables.
For most healthy people eating well, food comes first. Fermented foods and a varied, plant-rich diet feed and add to your existing community in a way a single-strain capsule usually can't match. Supplements have specific uses — after certain antibiotic courses, for instance — but they're best thought of as a targeted tool, not a daily substitute for the plate.
Usually because they arrived too fast. Your gut bacteria ferment fiber and produce gas as a normal by-product, and they need a couple of weeks to adjust to a bigger, more varied load. Build up gradually, drink water alongside, and the bloating almost always settles as your community adapts.
No. It's general nutrition information for a healthy adult audience. The gut microbiome is an active, evolving field, and individual needs differ. If you have a diagnosed gut condition, ongoing digestive symptoms, or you're immunocompromised, talk to a doctor or dietitian before making big changes — some conditions call for a very different approach to fiber and fermented foods.