The gut microbiome, the community of bacteria living in your digestive system, responds mainly to variety and fibre over time, rather than any single ingredient. The foods below are useful ways to increase dietary fibre, plant variety or live-culture intake, dietary features commonly discussed in relation to digestive and microbiome health, rather than each being individually proven to transform the microbiome on its own.
 A separate guide covers foods more specifically linked to bowel regularity, which overlaps with this list but isn't quite the same question.
→ New to this topic? Read:How to Improve Gut Health Naturally: A Complete Guide
→ Looking specifically for regularity? Read:Best Foods for Regular Digestion
1. Whole Grains
Oats, barley and wholemeal bread retain the fibre rich bran and germ that refined grains lose during processing. Barley in particular contains beta-glucan, a soluble fibre that has attracted research interest for its role in the gut.
→ Read more:Barley Benefits for Digestion
2. Legumes
Lentils, chickpeas and beans provide both soluble and insoluble fibre in a single food, along with protein. A serving of lentils or chickpeas can contribute a meaningful share of a day's fibre target.
3. Foods Containing Live Cultures
Some fermented foods, including certain yoghurts and fermented milk products, contain live microorganisms at the point they're eaten. It's worth being precise here: not every fermented food retains live cultures by the time it reaches the shelf, and a food containing live microorganisms isn't automatically the same as a "probiotic" in the strict sense of that term. Checking the label for "live cultures" is more useful than assuming.
4. Leafy Green Vegetables
Spinach, kale and similar greens are a straightforward source of fibre, easily stirred into a curry, blended into a smoothie or added alongside eggs.
5. Bananas
Particularly when slightly under ripe, bananas contain resistant starch, a type of starch that behaves similarly to fibre in the large intestine. As a banana ripens, more of this converts to ordinary sugar.
6. Berries
Raspberries and blackberries provide a useful amount of fibre for their sugar content, and their skins contribute a meaningful insoluble fibre component.
7. Nuts and Seeds
A small handful adds fibre alongside healthy fats and protein. Chia and flax seeds in particular are notably fibre dense for their size.
8. Dates
Dates provide natural sugars alongside a genuine amount of fibre, though portion is worth keeping in mind given how concentrated their sugar content is.
9. Vegetables With Skins Left On
Potatoes and carrots carry much of their fibre in the skin, so leaving it on, after washing, is a simple way to increase intake without changing what you're eating.
10. Kefir
Kefir is a fermented milk drink that can contain a mixture of bacteria and yeasts. Exact composition varies considerably between products, so check the label if live cultures are specifically what you're looking for.
11. Barley Porridge (Talbina)
Talbina, made from ground barley flour, provides barley in a soft, cooked porridge format. Barley contains gluten, so talbina and other barley based foods are not suitable for people with coeliac disease or anyone medically advised to avoid gluten.
Don't Forget Fluids
Fibre needs adequate water to move through the digestive system as intended. Increasing fibre intake without also increasing fluid intake can make digestion feel worse rather than better. A glass of water with each meal, alongside your normal intake through the day, supports this.
Building These Foods Into a Normal Week
A realistic approach is to add these foods gradually into meals you already eat, rather than attempting to include everything on this list at once. How quickly you notice a difference varies depending on your starting diet and the specific change you make, so there's no fixed timeline that applies to everyone.
→ Read more: Fibre-Rich Breakfast Foods
Frequently Asked Questions
What is the single best food for gut health?
There is no single best food. A varied diet including whole grains, legumes, foods with live cultures, and plenty of fruit and vegetables supports the gut microbiome more reliably than any one ingredient.
Do I need fermented foods for good gut health?
They can help introduce live microorganisms, but research into exactly how fermented foods affect the gut microbiome is still developing. A varied, fibre rich diet is the more established foundation.
Can eating too much fibre cause problems?
Increasing fibre intake suddenly, particularly from several sources at once, can cause temporary bloating for some people. A gradual approach tends to be more comfortable.
Is barley suitable for everyone?
No. Barley contains gluten and is not suitable for people with coeliac disease or anyone medically advised to follow a gluten-free diet.
Sources and Further Reading
Health note: This article is for general information and is not medical advice. Digestive needs vary, particularly for people with diagnosed gastrointestinal conditions. Speak to a GP or registered dietitian if symptoms are persistent, severe or unexplained.
Explore the Roohts Talbina Range
Discover our range of organic wholegrain barley Talbina, from classic plain to delicious flavoured varieties. Find the one you love, along with bundles and accessories to make your breakfast your own.
