Is gut health just about taking a probiotic? Or could the bacteria in your gut be shaping your body fat, inflammation and cholesterol? In this episode, Professor Nicola Segata, a pioneer of new gut technology, and ZOE’s Chief Scientist Professor Sarah Berry, explain a major breakthrough in gut science. After analysing more than 34,000 microbiomes, the team identified 50 gut bacteria strongly linked to better health. Even more striking, many of them were previously unknown to science. Nicola explains how his team ranked hundreds of gut bacteria to define the “top 50” linked to better health, and explore how these bacteria group into patterns connected to inflammation, blood sugar, heart health and body fat. We uncover how you can improve your overall health in weeks by optimising your microbiome, ask whether probiotics do what we think they do, and examine why plant diversity may matter more than any single supplement. This episode also reveals what happened when these findings were tested in trials, and why the results surprised even the scientists. Are you feeding the right gut bacteria? And, if not, what will happen to your health if you start today? 🌱 Try our science-backed and tasty wholefood supplement Daily 30+ Get our brand-new app and Gut Health Test designed by world-leading gut health and nutrition scientists to build healthy eating habits 👉 Join ZOE Follow ZOE on Instagram. Timecodes 00:00 Intro 03:00 The biggest microbiome breakthrough in a decade 08:20 The problem with most gut research 10:25 Scientists identified the top 50 gut bacteria 11:05 The first real way to measure gut health 13:45 The “dark matter” scientists found in our guts 15:50 Why bad gut bacteria love sugar 16:30 The red meat chemical your microbes can create 18:30 The microbiome score out of 1,000 21:10 Why your microbiome is easier to change than your body 23:15 Old microbiome tests can reveal new discoveries 25:30 The 4 microbiome clusters linked to health 26:40 The gut clusters linked to inflammation, cholesterol and body fat 28:05 Why one “good bug” isn’t enough 31:25 Can diet really change your microbiome in weeks? 32:25 What happened when people changed their diet 35:10 The gold-standard trials behind this research 36:10 Why you can’t just take good bacteria in a pill 40:35 Probiotics vs prebiotics: the surprising result 41:50 The 30-plant result that shocked scientists 44:05 Why modern diets may starve our microbiome 46:10 You can pick up gut microbes from other people 47:45 Why one fibre supplement won’t fix your gut 50:35 The menopause example that shows gut bugs matter 54:30 What happens to your microbiome after antibiotics 58:35 The simple resistant starch gut health hack 📚Books by our ZOE Scientists The Food For Life Cookbook Every Body Should Know This by Dr Federica Amati Food For Life by Prof. Tim Spector Ferment by Prof. Tim Spector Free resources from ZOE The Hormone Harmony Guide: Tuning Your Body’s Internal Orchestra Eating for Better Brain Health: Your brain-gut blueprint How to eat in 2026 - Discover ZOE’s 8 nutrition principles for long-term health Live Healthier: Top 10 Tips From ZOE Science & Nutrition Gut Guide - For a Healthier Microbiome in Weeks  Better Breakfast Guide Mentioned in today's episode Huge microbiome breakthrough from ZOE, thanks to community science Does ZOE work? The evidence Introducing gut bug clusters Sending babies to nursery completely reshapes their microbiomes, Nature (2026) The foods you must avoid to live longer | Dan Buettner Have feedback or a topic you'd like us to cover? Let us know here. Episode transcripts are available here.