Chronic diseases like heart disease, diabetes, and obesity are killing more people than ever before. Could your diet be the biggest driver of this risk?

Today, Dr Mark Hyman explains why food matters more than genetics for long-term health, and how one diet change can make the biggest difference. 

Alongside Professor Tim Spector, Mark, a 15-times New York Times bestselling author and a practising family doctor, explores how modern eating is linked to chronic disease and what the science says reduces risk.

We break down how food is designed to make us eat more, how this affects metabolism, insulin and inflammation, and why this matters more than your genes.

By the end of the episode, you’ll understand the single most important dietary change Mark believes can lower chronic disease risk, based on clinical experience.

If the modern world is driving these conditions, what’s one small change you can make to take back control of your future health?

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Timecodes

00:00 Intro

04:12 Why birth is designed to be messy

08:32 Why your first microbes shape everything later

10:46 Can you replace microbes after a C-section?

13:05 Why the first few years matter more than the rest

15:54 Why antibiotics always come with a hidden cost

17:42 How families swap microbes without realising

19:06 Why microbes survive in some places — and not others

21:25 Why bigger social groups protect your immune system

22:30 How scientists can tell who you live with

24:15 Why closeness matters more than genetics

25:38 Can you catch bad gut bugs from other people?

26:29 Can anxiety spread through gut microbes?

27:55 How scientists now rank “good” and “bad” gut bugs

31:05 Why countryside living changes your gut health

33:49 Why getting dirty may improve mental health

35:33 Why sterilising everything can backfire

38:05 Why pets — especially dogs — boost gut health

42:18 Can your partner improve your health without dieting?

43:25 Why loneliness harms your gut microbiome

45:25 The shared habit of long-living communities

52:01 Why fighting germs may be harming your health

📚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

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
  Food Fix Uncensored: Inside The Food Industry's Biggest Cover-Ups by Mark Hyman
  


• Salt, Sugar, Fat: How the Food Giants Hooked Us by Michael Moss


• Nourishment: What Animals Can Teach Us about Rediscovering Our Nutritional Wisdom by Fred Provenza


• 
  Global Burden of Disease study: Diet vs. smoking, Lancet (2019)


• 
  Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain, Cell (2019)


• 
  The study of food addiction, Appetite (2010)


• Can fermented food fight inflammation?


• 
  Breast Cancer Risk among US-Resident Polish Migrant Women, IJERPH (2021)


• 
  
  Milk and Health, NEJM (2020)

Have feedback or a topic you'd like us to cover? Let us know here.

Episode transcripts are available here.