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

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Mar 19, 2026

Prof Sarah Berry, King's College nutrition expert, and Prof Nicola Segata, computational microbiome pioneer, explain how 50 gut bacteria link to body fat, inflammation and cholesterol. They reveal how these microbes were ranked from 34,000 samples. They discuss unknown microbial “dark matter,” why plant diversity and whole‑food prebiotics shift microbes in weeks, and how some species resist change.

01:03:06

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insights

INSIGHT

Top 50 Gut Bacteria Define A Health Signature

Researchers ranked ~661 gut species and identified a top 50 linked to healthier diets and cardiometabolic markers.
The top 50 are more abundant and present in healthier people, forming the basis for a measurable microbiome health signature.

insights

INSIGHT

Microbiome Health Summed Into A 1,000 Point Score

Zoe created a microbiome score out of 1,000 that weights presence and abundance of good and bad species to summarise gut health.
The score combines counts of top/bottom species and their abundances using algorithms tuned to health outcomes.

insights

INSIGHT

Dark Matter Bacteria Are Key To Gut Health

Many health-associated microbes are previously uncultured 'dark matter' discovered via metagenomics, so their biology remains unknown.
The team named some new species from genomes but cannot yet grow or fully characterise them in the lab.

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Why this Nature microbiome paper matters

02:17 • 2min

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Need for huge numbers and diverse populations

04:28 • 4min

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Two-part study: links and causal trials

08:07 • 3min

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Defining the top 50 and bottom 50 microbes

11:07 • 2min

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What makes microbes 'good' or 'bad'

13:30 • 2min

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Dark‑matter microbes discovered

15:10 • 3min

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Microbes convert food into harmful chemicals

18:38 • 1min

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Building a microbiome health score

19:44 • 3min

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Microbiome is changeable—faster than body traits

22:26 • 2min

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Re‑analyzing older metagenomes with new knowledge

24:30 • 2min

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Four microbiome clusters linked to health

26:48 • 3min

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Why one 'good bug' isn't enough

30:12 • 2min

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Do diets change microbes in weeks?

32:15 • 1min

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Trial results: top microbes increase with diet

33:41 • 4min

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Why RCTs provide causal evidence

37:26 • 59sec

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Biome study: whole‑food prebiotic vs probiotic

38:25 • 1min

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Prebiotic supplement produced large microbiome shifts

39:43 • 2min

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Plant diversity likely depleted in modern diets

42:04 • 2min

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Microbe exchange between people and environments

43:51 • 2min

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Which microbes resist change after diet shifts

45:39 • 1min

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Fiber diversity, polyphenols, and the 30‑plant idea

46:59 • 3min

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Soy isoflavones, gut microbes, and menopause

49:51 • 3min

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Personalized 'gut boosters' and targeted foods

52:35 • 54sec

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Recovering after antibiotics and micro‑sources

53:29 • 3min

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Social interaction may underpin longevity zones

56:05 • 55sec

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Increase good microbes to crowd out bad ones

57:00 • 1min

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Practical hack: resistant starch from cooled starches

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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

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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