Gut Health
Your gut is where food, immunity and mood meet. What you feed it changes all three — and the single most useful number is not one you get from a test.
Why it matters
Gut health is sold as a testing problem. Our own topics point the other way. The levers that work are things you can count in your shopping basket, and the tests are what experts trust least.
Key insights from this synthesis
- Variety of plants matters more than quantity of fibre. Different bacteria eat different things.
- In one trial, fermented food beat a high-fibre diet for microbial diversity and inflammation. It adds to fibre rather than replacing it.
- The same food does not work for everyone. Only a third to a half of people carry the microbes that make soy help with menopause symptoms.
- The boldest claim in this area rests on one expert and one patient — and our own topic says so.
- The bacteria in your gut may be more of a mirror than a driver. Better food changes both, and today's evidence cannot fully separate cause from reflection.
Draws evidence from 25 expert discussions across 3 topics — 14% of our analysed library.
Synthesised 2026-07-21
Explore the evidenceTopics synthesised from multiple expert discussions.
Topics behind this synthesis
This Health Area is built from 3 topics, each analysed in full. As more evidence is added, it grows.
- Gut Microbiome🎧🔒
Supports 28 findings on this page, including Blood sugar and weight · How many different plants you eat · Fermented food
- Gut-Brain Axis
Supports 11 findings on this page, including The boldest claim here rests on one expert and one patient · Your immune system · Long-running inflammation
- Coffee & Health
Supports 7 findings on this page, including Does decaffeinated coffee do the same job? · Heart risk · Coffee, as a daily plant input