In this groundbreaking episode, Jonathan, Tim, and guest researcher Professor Quirijn de Mast explore a landmark clinical trial conducted in partnership with Tanzanian scientists and community members at the Kilimanjaro Christian Medical Centre (KCMC).

Published in Nature Medicine, the study investigates what happens when people switch between Western-style eating and a traditional diet from the Kilimanjaro region of Northern Tanzania — rich in fermented foods, legumes, ancient grains, and green vegetables.

The results? Rapid, measurable changes to immune function, inflammation, and gut health — with powerful implications for global disease risk.We dive into the science behind millet porridge, fermented banana beer, and the fibre-rich meals that Tanzanian communities have eaten for generations.

Quirijn shares insights from his 20-year collaboration with local researchers.

This episode explores scientific research on traditional East African diets and inflammation, led by Quirijn in close collaboration with Tanzanian scientists and participants. As Western scientists and hosts, we are aware of the need for humility when discussing cultural traditions not our own, and we approach this conversation with respect and curiosity.

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Timecodes

00:00 Can This African Diet Transform Your Health in 2 Weeks?

02:47 What Makes African Diets Healthier Than Mediterranean?

05:17 The Mediterranean Diet: Are We Getting It Wrong?

07:57 Africa’s Forgotten Superfood: Ancient Grain Porridge

10:37 Are These Ancient Grains the Original Superfoods?

13:17 Diet Changes That Predict Disease — Here’s How

15:58 What Pre-Western Diets Reveal About Human Health

18:31 We Built a Pop-Up Restaurant on Mount Kilimanjaro

21:00 This Fermented Banana Beer Might Boost Immunity

23:23 Inflammation Skyrockets After Just 2 Weeks on This Diet

26:07 Can a Fermented Drink Reverse Western Diet Damage?

28:47 How Food Labels Trick You Into Thinking You're Healthy

31:38 Is Your Immune System Running on the Wrong Fuel?

34:12 These Roots Are Healthier Than Potatoes — Here’s Why

36:51 Your Porridge Is Making You Unhealthy (Without You Knowing)

39:35 What People Actually Eat on a Traditional African Diet

42:21 Pasteurised Fermented Foods — The Surprising Downside

45:06 Most People Don’t Eat Enough Fiber. Do You?

47:49 Why One Diet Doesn’t Work for Everyone

50:33 The #1 Diet Swap to Transform 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

Free resources from ZOE

Live Healthier: Top 10 Tips From ZOE Science & Nutrition

Gut Guide - For a Healthier Microbiome in Weeks 

Mentioned in today's episode
Immune and metabolic effects of African heritage diets versus Western diets in men: a randomized controlled trial, Nature Medicine (2025) 

Global Impacts of Western Diet and Its Effects on Metabolism and Health: A Narrative Review, Nutrients (2023) 

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

Episode transcripts are available here.

Today we’re talking about obesity medication.

Did you know that over 200 illnesses are linked to unhealthy weight gain? It's no surprise that combatting obesity has become a major focus of modern medical research.

In recent years, this research has led to a new generation of weight-loss medications that are delivering dramatic results. But are these drugs truly revolutionary or just too good to be true?

One thing is certain - people have a lot of questions. Today, I’m joined by Dr. Lou Aronne to help us separate the hype from the hard facts.

🥑 Make smarter food choices. Become a member a zoe.com - 10% off with code PODCAST

🌱 Try our new plant based wholefood supplement - Daily30+

*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system

📚 Books from our ZOE Scientists:

The Food For Life Cookbook by Prof. Tim Spector

Food For Life by Prof. Tim Spector

Every Body Should Know This by Dr Federica Amati

Free resources from ZOE:

Live Healthier: Top 10 Tips From ZOE Science & Nutrition 

Gut Guide - for a healthier microbiome in weeks

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

Listen to the full episode here

What if your blood pressure — even just a little too high — is quietly damaging your brain? What if it’s increasing your risk of a heart attack or stroke, without you ever feeling a thing?

In this episode, Professor Tim Spector reveals why blood pressure is one of the most overlooked – and most dangerous – health issues today. He explains why “normal for your age” might not be safe at all, why medication alone isn’t the full answer, and how small, daily changes could dramatically reduce your risk of serious disease.

Can your gut microbes raise your blood pressure? Can a banana be as powerful as a pill? Is beetroot juice really three times more effective than cutting salt?

You’ll also learn why 80% of the salt we eat isn’t from the shaker, how stress and sleep secretly push your pressure up, and what most doctors still miss when treating hypertension.

If you’ve ever been told your blood pressure’s “fine” — or never measured it at all — this episode might change the way you think about your future health.

Unwrap the truth about your food 👉 ⁠Get the ZOE app

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Timecodes

00:00 Introduction

03:29 What actually is high blood pressure?

05:57 Why everyone should own a blood pressure monitor

07:01 What your blood pressure reading really means

09:59 Stress and high blood pressure

11:28 The $20 gadget that can save your life

13:17 When to see a doctor

14:35 What causes high blood pressure

16:57 Salt and blood pressure

18:28 Why reducing salt didn’t work for Tim

20:09 Blood pressure medications

22:04 Why high blood pressure is so dangerous

24:20 How blood pressure quietly damages your brain

27:18 Is it too late to lower your blood pressure?

31:31 How your gut microbes affect blood pressure

34:14 Why potassium matters more than salt

36:29 How sleep, stress & saunas impact your blood pressure

38:58 The real source of excess salt in your diet

41:37 Should you switch to potassium salt?

49:30 Beetroot juice: better than salt restriction?

📚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

Free resources from ZOE

Live Healthier: Top 10 Tips From ZOE Science & Nutrition

Gut Guide - For a Healthier Microbiome in Weeks 

Studies referenced in today's episode:

Nonpharmacologic Interventions for Reducing Blood Pressure in Adults With Prehigh blood pressure to Established high blood pressure, Journal of the American Heart Association (2020)

Long-Term Effect of Intensive vs Standard Blood Pressure Control on Mild Cognitive Impairment and Probable Dementia in SPRINT, Neurology (2025)

Blood pressure reduction and all-cause dementia in people with uncontrolled high blood pressure: an open-label, blinded-endpoint, cluster-randomized trial, Nature Medicine (2025)

high blood pressure Associated With Hearing Loss and Tinnitus Among Hypertensive Adults at a Tertiary Hospital in South Africa, Frontiers in Neurology (2022)

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

Episode transcripts are available here.

Today we’re talking about resistance training.

When we think of exercising in our 70s and 80s, we often focus on gentle activities like walking or swimming some lengths in a pool. However, are we overlooking a crucial part of the fitness puzzle? Something that could truly transform our later years: Strength training.

Because as we age, muscle loss isn’t just about losing tone - it’s about losing independence.

Dr. Brad Schoenfeld joins me to share how resistance training can preserve strength, improve mobility, and support a long and active life. Whether you’ve got five minutes or fifty, he’ll show you how to get started - no gym membership required.

🥑 Make smarter food choices. Become a member a zoe.com - 10% off with code PODCAST

🌱 Try our new plant based wholefood supplement - Daily30+

*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system

📚 Books from our ZOE Scientists:

The Food For Life Cookbook by Prof. Tim Spector

Food For Life by Prof. Tim Spector

Every Body Should Know This by Dr Federica Amati

Free resources from ZOE:

Live Healthier: Top 10 Tips From ZOE Science & Nutrition 

Gut Guide - for a healthier microbiome in weeks

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

Listen to the full episode here

What if the fatigue, stiffness, and brain fog we blame on aging are actually symptoms of something we can change?

In this episode, immune aging expert Professor Janet Lord unpacks “inflammaging” - a slow, chronic form of inflammation that quietly builds in the body as we get older. It’s now believed to drive many of the diseases we associate with aging, from dementia to heart disease.

Janet reveals how this invisible inflammation takes hold, how it silently damages the brain, gut, and immune system - and what science says we can do to fight back. Her research has shown that even in your 70s, it's not too late to reverse immune aging. One small change tomorrow could make a measurable difference.

Professor Janet Lord is a world leading expert in the biology of aging. She’s published over 200 scientific papers and advised UK health policy. Her groundbreaking work shows how daily habits - especially movement - can reshape the immune system and slow the effects of time.

If you want to stay stronger, sharper, and healthier for longer, this conversation could change the way you think about aging.

🥑 Make smarter food choices. Become a member at zoe.com - 10% off with code PODCAST

🌱 Try our new plant based wholefood supplement - Daily 30+

Follow ZOE on Instagram.

Timecodes:

00:00 What is inflammaging?

02:23 The biggest misconception about inflammaging

03:20 Inflammation can grumble away for decades

04:01 What cytokines in your blood really mean

05:00 Why inflammation is helpful — until it isn’t

06:19 A small rise in inflammation can last for decades

07:45 Inflammation acts like immune system hormones

08:50 Why more immune activity isn't always better

10:00 Did modern life create chronic inflammation?

12:00 Why flu is deadly for older people

13:15 Inflammation breaks down muscle and bone

15:15 Why fat tissue is fueling your immune system

16:51 Why body fat isn’t just a passive energy store

18:10 How inflammation helps cause dementia and heart disease

20:50 In your 40s? You might already be aging faster

22:03 Why menopause triggers a rise in inflammation

24:40 The gut bacteria that leak into your blood

27:15 Your muscles produce anti-inflammatory signals

28:55 Sitting too long cancels out your workout

30:44 Why walking stairs beats living in a bungalow

33:35 Janet’s one-day-a-week fast for 30+ years

34:55 10,000 steps = no inflammation?

35:57 Overweight people see the biggest benefit from exercise

📚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 SpectorFree resources from ZOE

Live Healthier: Top 10 Tips From ZOE Science & Nutrition

Gut Guide - For a Healthier Microbiome in Weeks 

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

Episode transcripts are available here.

Today we’re talking about sleep.

Are you a good sleeper? It’s something we all aim for, yet many of us fall short. And the consequences of a poor night’s sleep go far beyond just feeling groggy the next day. In fact, sleep plays a pivotal role in our long term health - influencing everything from our mood to our immune system, and even how long we live.

So how do you get better sleep in a world that never seems to rest?

I’m joined by sleep scientist Prof. Matt Walker to unpack the latest sleep science and share his top tips to getting a good nights rests.

🥑 Make smarter food choices. Become a member a zoe.com - 10% off with code PODCAST

🌱 Try our new plant based wholefood supplement - Daily30+

*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system

📚 Books from our ZOE Scientists:The Food For Life Cookbook by Prof. Tim Spector

Food For Life by Prof. Tim Spector

Every Body Should Know This by Dr Federica Amati

Free resources from ZOE:

Live Healthier: Top 10 Tips From ZOE Science & Nutrition 

Gut Guide - for a healthier microbiome in weeks

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

Listen to the full episode here

From collagen powders to $100 creams, the skincare industry thrives on promises. However, many of the products we rely on for younger, healthier skin are built on shaky evidence. In this episode, world-renowned dermatologist Professor John McGrath breaks down what’s real and what’s not.

We explore how skin truly ages, what happens beneath the surface, and why some popular treatments don’t do what they claim. John dismantles three of the biggest myths in skincare, including the truth about SPF, collagen, and “bio-active” ingredients that never make it past the top layer of your skin.

Professor McGrath is a Professor of Molecular Dermatology at King’s College London and editor of the British Journal of Dermatology. His research has transformed how we understand genetic skin disorders and vitamin D’s role in skin health.

This conversation is packed with surprising insights - and one daily step that really does support healthier skin as you age.

🥑 Make smarter food choices. Become a member at zoe.com - 10% off with code PODCAST

🌱 Try our new plant based wholefood supplement - Daily 30+

*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system

Follow ZOE on Instagram.

Timecodes

Timecodes

📚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

Free resources from ZOE

Live Healthier: Top 10 Tips From ZOE Science & Nutrition

Gut Guide - For a Healthier Microbiome in Weeks 

Mentioned in today's episode

Genome-wide association study identifies 143 loci associated with 25 hydroxyvitamin D concentration, Nature Communications (2020)

Topical tretinoin for treating photoaging: A systematic review of randomized controlled trials, Int J. Womens Dermatology (2022)

Sunlight Has Cardiovascular Benefits Independently of Vitamin D, Blood Purification (2016)

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

Episode transcripts are available here.

Today we’re zooming in on our gut.

It’s our favourite topic here at ZOE and for good reason! Research into the microbiome continues to reveal just how astonishingly far-reaching its effects are. From immune function to metabolic health, and even mental well-being, your gut is quite literally at the centre of everything!.

I’m joined by microbiome experts Nicola Segata and Tim Spector to recap how we can nurture and take care of it in our daily lives.

Unwrap the truth about your food 👉 ⁠⁠Get the ZOE app⁠

🌱 Try our new plant based wholefood supplement - Daily30+

*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system

📚 Books from our ZOE Scientists:

The Food For Life Cookbook by Prof. Tim Spector

Food For Life by Prof. Tim Spector

Every Body Should Know This by Dr Federica Amati

Free resources from ZOE:

Live Healthier: Top 10 Tips From ZOE Science & Nutrition 

Gut Guide - for a healthier microbiome in weeks

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

Listen to the full episode here

Can pills and powders really improve our health? Despite their clinical look, most supplements aren’t tested with the scientific rigour we expect from medical treatments, and many don’t live up to their promises.

Today, we're joined by two of ZOE’s top scientists to uncover the truth. They share groundbreaking new research and reveal the results of a brand new randomized controlled trial that could reshape how we think about supplements and introduce an entirely new kind.

Tim Spector is one of the world’s top 100 most cited scientists, a professor of epidemiology, and ZOE’s scientific co-founder. He’s joined by Dr. Sarah Berry, a world leading expert in large scale human nutrition studies, Professor of Nutrition at King’s College London, and Chief Scientist at ZOE.

By the end of this episode, you’ll have the latest science to help you make informed decisions about supplements and understand what your gut health really needs in 2025.

Unwrap the truth about your food 👉 ⁠Get the ZOE app

Follow ZOE on Instagram.

Timecodes

00:00 Can supplements actually harm your health?

02:55 Why vitamin pills can do more harm than good

05:45 The truth behind scurvy, rickets, and early nutrition

08:30 Why we’re still stuck in a post-war supplement mindset

11:15 Should you supplement if you’re not deficient?

14:00 What calcium supplements are really doing to your heart

16:50 The real reason food companies add vitamins

19:20 The problem with your diet isn’t deficiency

21:45 Why fixing your diet is harder than it sounds

24:30 Why we need a new kind of supplement

27:10 Whole plants vs powders: why structure matters

29:40 Why plant diversity is the future of gut health

32:10 What’s the difference between prebiotics and probiotics?

35:05 Inside the randomized trial testing a new gut supplement

37:45 The science behind measuring real health impact

40:00 How the gut supplement changed the microbiome

42:30 Why probiotics worked… but much less

45:10 The surprising link between microbes and mood

48:20 How much did cholesterol and inflammation improve?

51:30 Could this reshape how we supplement in the future?

📚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 SpectorFree resources from ZOE

Live Healthier: Top 10 Tips From ZOE Science & Nutrition

Gut Guide - For a Healthier Microbiome in Weeks 

Mentioned in today's episode

The Evolution of Science and Regulation of Dietary Supplements: Past, Present, and Future, The Journal of Nutrition (2024)

Supplemental Vitamins and Minerals for Cardiovascular Disease Prevention and Treatment, Journal of the American College of Cardiology (2021)

Long-term multivitamin supplementation and cognitive function in men: a randomized trial, National Library of Medicine (2013)

A diverse high-fibre plant-based dietary intervention improves gut microbiome composition, gut symptoms, energy and hunger in healthy adults: a randomised controlled trial, MedRxiv (2024)

On calcium supplementation:

Dietary calcium intake and risk of fracture and osteoporosis: prospective longitudinal cohort study, British Medical Journal (2011)

Vitamin D and Calcium for the Prevention of Fracture: A Systematic Review and Meta-analysis, JAMA (2019)

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

Episode transcripts are available here.

Today we’re diving into protein.

It’s the nutrient at the centre of some of the biggest debates in nutrition - especially when it comes to building muscle. And as more people adopt plant-based diets, one question keeps coming up: Can non-meat proteins really support strength and overall health?

So, what does the science say? Is it better to get our protein from animals or plants?

I’m joined by nutrition expert Simon Hill and Dr. Will Bulsiewicz to break down the benefits of both, and to explore how we can build muscle in the healthiest, most sustainable way.

Unwrap the truth about your food 👉 ⁠⁠Get the ZOE app⁠

🌱 Try our new plant based wholefood supplement - Daily30+

*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system

📚 Books from our ZOE Scientists:The Food For Life Cookbook by Prof. Tim Spector

Food For Life by Prof. Tim Spector

Every Body Should Know This by Dr Federica Amati

Free resources from ZOE:

Live Healthier: Top 10 Tips From ZOE Science & Nutrition 

Gut Guide - for a healthier microbiome in weeks

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

Listen to the full episode here