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Professor Tim Spector: I was wrong about Vitamin D & sunlight! The 7 health habits he's changed his mind about

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Mar 12, 2026

Guest

Tim Spector

Professor Tim Spector, epidemiologist and microbiome researcher, reflects on seven health beliefs he has revised after new evidence. He discusses vitamin D and sunlight, oral health linked to brain aging, microplastics in blood, omega-3 testing and food-based boosts, personalized B12 and folate choices, and shifting exercise and sleep habits.

53:25

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insights

INSIGHT

Gut Microbiome Still Central To Health

The gut microbiome remains central to overall health, with growing immunology and diet research linking microbes to mental and physical outcomes.
Tim cites ZOE studies showing gut improvements can benefit brain, metabolic and short-term health markers.

insights

INSIGHT

Ultra Processed Foods Rival Smoking

Ultra-processed foods are emerging as a top public-health threat, possibly surpassing smoking, and need clearer risk-level definitions.
Tim supports ZOE's refined categories (low/medium/high) to better target harmful products worldwide.

insights

INSIGHT

Omega-3 Index Beats Ratio Thinking

The omega-3 index (EPA/DHA in blood cells) is a more meaningful clinical measure than omega-3/6 ratios.
Tim explains the ratio idea is outdated and clinical research now focuses on key omega-3 levels in cell membranes.

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Why nutrition advice keeps changing

01:15 • 3min

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How scientists judge evidence

04:02 • 6min

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Vitamin D and fracture evidence reversal

09:45 • 2min

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Unchanged convictions: microbiome and ultra-processed foods

12:02 • 3min

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Oral health's link to dementia

14:35 • 4min

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Microplastics found in blood and actions

18:52 • 3min

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Testing and raising omega‑3s with real food

22:00 • 6min

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B12 and folic acid: personal genetics matter

27:48 • 4min

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Vitamin D: nuance, sun and food options

32:01 • 6min

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Exercise: diversify and add resistance

37:41 • 3min

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Creatine showed small gains, so he stopped

41:02 • 56sec

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Sleep improvements and personalised hacks

100+ gut friendly recipes to feel better every day

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Good Mood Food is a science-based cookbook that explains how what we eat directly affects our mood, mental health, and long-term brain health. Drawing on the latest research about the gut-brain connection, Tim Spector provides practical, budget-friendly recipes and meal ideas—from weekend batch-cooking to energy-boosting breakfasts and soothing suppers—designed to nourish the gut microbiome and improve daily wellbeing.

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The New Science of a Lost Art

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Food for Life Cookbook

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In 'Food for Life', Tim Spector draws on over a decade of cutting-edge scientific research and his own personal insights to deliver a new approach to nutrition. The book empowers readers to make informed food choices, highlighting the importance of food for health, mental well-being, immunity, and the environment. Spector challenges conventional diet myths and provides practical, science-based advice on how to eat well in the age of ultra-processed foods.

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Every Body Should Know This

The Science of Eating for a Lifetime of Health

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In 'Every Body Should Know This', Dr. Federica Amati explores the real science behind nutrition, offering insights into what foods work best for the bodies and minds of individuals at various life stages. The book covers topics such as the truth about superfoods and ultra-processed foods, the role of nutrition from before conception to senior years, and how food choices can support longevity. It provides practical, evidence-based strategies for men, women, and children to make informed dietary decisions.

What health habits actually protect your brain and long-term health?

In this episode, Professor Tim Spector shares the seven health ideas he has changed his mind about after reviewing new research. From oral health and inflammation to vitamin D, sleep, and exercise, Tim explains the daily habits he now prioritises and helps us understand what we should do differently if the science changes.

Tim revisits 7 common health beliefs and explains how new evidence has shifted his thinking. He explores the link between oral health, inflammation and brain ageing, and discusses vitamin D, sunlight and omega-3s. The conversation also looks at sleep timing, exercise and how everyday habits interact with our biology.

Tim also shares the small changes he now makes in his own routine and provides practical ideas for incorporating them into your daily life.

We all know that science evolves as new evidence emerges, so if the research changes, should our daily health habits change too?

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Timecodes

00:00 Intro

04:00 The nutrition advice scientists completely reversed

08:30 How scientists decide if a health trend is real

10:30 The vitamin D discovery that fooled scientists for years

12:35 The one health belief Tim is more convinced about than ever

14:00 The public health threat Tim says may be worse than smoking