Omega-3s and brain health: what the science really says  | Dr. Bill Harris & Prof. Sarah Berry

Omega-3s and brain health: what the science really says | Dr. Bill Harris & Prof. Sarah Berry

Omega-3 fatty acids have long been lauded for heart health benefits. Yet, emerging research now points to an even more profound impact, directly on our most complex organ: the brain. Today, we delve into the critical, often misunderstood, role of omega-3s in cognitive function, mental well-being, and even the prevention of neurodegenerative conditions like dementia. We are joined by Dr. Bill Harris, a globally recognised authority in omega-3 fatty acid research. Bill is a Professor at the University of South Dakota and has over 300 peer-reviewed publications. His foundational work includes pioneering studies on fish oil in the 1980s and shaping American Heart Association scientific statements. In this episode, Dr. Harris - along with ZOE's Chief Scientist Professor Sarah Berry - illuminate why most individuals may be operating with suboptimal omega-3 levels, and the tangible implications this has for mood regulation, anxiety, and long-term brain resilience. We navigate nuances between omega-3 types like EPA and DHA, debunk common misconceptions surrounding plant-based sources and mercury content in fish, and explore the precise methods for assessing and improving your own "Omega-3 Index." Unwrap the truth about your food 👉 ⁠⁠Get the ZOE app⁠ 🌱 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. Measure your Omega 3s https://omegaquant.com/https://omegaquant.com/ Timecodes 00:00 Do Omega 3s Really Protect Your Brain? 01:46 Are We Deficient in Omega 3? 02:15 Plant vs. Fish: Omega 3 Sources Explained 03:34 Are EPA & DHA Really "Essential"? 05:03 The Omega 3 Family Tree: ALA, EPA, and DHA 07:05 Plant Based Myth: Omega 3 Conversion Rates 11:00 The "Optimal" Omega 3 Level: Are You There? 12:51 Historical Omega 3 Intake: What Did Our Ancestors Eat? 14:19 Are Omega 3s Only For Heart Health? 15:13 Why Fish Oil First Made Headlines 18:47 Why Are Omega 3s so Great for Your Heart 21:01 Clearing the Confusion: Omega 3 Supplements for Heart Health 25:11 Omega 3s and Longevity 28:18 Omega 3s and Brain Health: The Latest Science 29:15 Dementia Risk: Omega 3 Levels in the Brain 30:01 Mental Health Breakthrough: Omega 3s for Anxiety & Depression 32:41 EPA vs. DHA for Depression: The Surprising Findings 35:28 The Blood Brain Barrier: Can Omega 3s Reach Your Brain? 38:40 Measuring Your Omega 3 Index: How to Get Tested 42:20 Mercury in Fish: Is it a Real Concern? 45:19 Farmed vs. Wild Salmon: What's the Difference? 48:50 The Omega 6 to Omega 3 Ratio: A Useless Metric? 54:50 Vegan & Vegetarian Options: Algae Based Omega 3s 📚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 Associations of plasma omega-3 fatty acid levels and reported fish oil supplement use with depression and anxiety: A cross-sectional analysis from the UK Biobank, 2025 The Association Between Plasma Omega-3 Fatty Acids and Suicidal Ideation/Self-harm in the United Kingdom Biobank, 2025, Plasma Omega-3 Fatty Acids and Risk for Incident Dementia in the UK Biobank Study: A Closer Look, 2013, NutrientsFish consumption advice is depriving children of neurolipids and other nutrients essential to brain and eye development, 2025, NeuroToxicology Have feedback or a topic you'd like us to cover? Let us know ⁠here⁠. Episode transcripts are available ⁠here⁠.

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Inside Tim Spector’s weekly food shop - 6 grocery rules to lower your blood pressure, cholesterol, and heart disease risk | Prof Tim Spector & Prof Sarah Berry

Inside Tim Spector’s weekly food shop - 6 grocery rules to lower your blood pressure, cholesterol, and heart disease risk | Prof Tim Spector & Prof Sarah Berry

Supermarket shelves are full of foods promising to be healthy: high-protein, low-fat, gluten-free, sugar-free. How do you know what's true? Today, Professors Tim Spector and Sarah Berry, world-leadi...

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Most replayed moment: What your wearable is really telling you | Dr Malcolm Finlay

Most replayed moment: What your wearable is really telling you | Dr Malcolm Finlay

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Picture the sound of a bone snapping - the kind of sound that makes you wince - and ask yourself how often you’ve thought about your bone health. Most of us only think about bone density when somethi...

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Most replayed moment: How to build a better breakfast | Prof. Ben Gardner & Tim Spector

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We’ve all heard the saying: Breakfast is the most important meal of the day. And while it may sound like a cliché, there’s some truth to it. Because for many of us, breakfast is the one meal we keep t...

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Are some of your "healthy" foods actually high-risk ultra-processed foods? For decades, nutrition advice seemed relatively straightforward. Eat less sugar. Less salt. Less saturated fat. Then it all...

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Most replayed moment: The hormone that controls your weight | Dr Andrew Jenkinson

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Floating through all of our bodies is a complex network of hormones. You can think of it as an internal postal service, delivering vital messages and instructions to different organs and systems. But...

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The secret to coping with stress - how to protect your brain and body, and feel calmer now | Prof Carmine Pariante

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Growing up, many of us were taught to just stay calm and carry on - as if stress was all in the mind, with no real effect on the body. But chronic stress can change your brain, raise your risk of hear...

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Most replayed moment: The hidden battle inside your gut | Tim Spector & Nicola Segata

Most replayed moment: The hidden battle inside your gut | Tim Spector & Nicola Segata

Today we’re talking about gut microbes. Professor Tim Spector often refers to the microbes in our gut as ‘mini pharmacies’. This is because they provide us with powerful chemicals that help support o...

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