How to feed the 50 gut bacteria that shrink body fat, calm inflammation and cut cholesterol | Prof Nicola Segata & Prof Sarah Berry

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?

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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

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Episode transcripts are available here.