Most cited scientist in the WORLD gives diet advice | Dr. Walter Willett

We're swimming in conflicting nutrition advice, so why not go straight to the definitive source? I sit down with Dr. Walter Willett, Professor of Nutrition at Harvard, and the most cited nutrition scientist in the world. With a half century of research & data from hundreds of thousands of participants in the Nurses' Health Study and the Health Professionals Follow-up Study, Dr. Willett has done more to define what a healthy diet actually looks like than almost anyone else in history. We cut through the noise of internet fad diets to discuss what the highest-quality, long-term data actually proves about longevity, chronic disease, and what we should put on our plates. We cover: Carbohydrate Confusion: The crucial difference between whole grains and potatoes (and his new 2025 substitution study). Protein Sources: How beef is the most pro aging food. The Truth About Fats: Reflecting on the landmark 1993 trans-fat paper that changed the food industry (and the massive pushback he received). If you want rigorous, peer-reviewed science rather than the latest social media trend, this is an interview you cannot miss. Don't forget to like, subscribe, and share this video with anyone who needs a dose of real nutrition science! BOOKS: Eat, Drink, and Be Healthy: The Harvard Medical School Guide to Healthy Eating by Walter Willett https://a.co/d/0agTI4Zh Nutritional Epidemiology, 3rd Edition by Walter Willett https://a.co/d/0bgJUThX Breaking Boundaries: The Science of Our Planet by Johan Rockström https://a.co/d/062OhrdW PAPERS & REPORTS: EAT-Lancet 2025: Global food transformation needed to ease pressure on the planet and save millions of lives https://www.stockholmresilience.org/research/research-stories/2025-10-03-eat-lancet-2025-global-food-transformation-needed-to-ease-pressure-on-the-planet-and-save-millions-of-lives.html The EAT Lancet full PDF: https://www.donorplatform.org/wp-content/uploads/2025/10/PIIS0140673625012012.pdf Meat vs EAT-Lancet: The dynamics of an industry-orchestrated online backlash https://changingmarkets.org/report/meat-vs-eat-lancet-the-dynamics-of-an-industry-orchestrated-online-backlash/ Optimal dietary patterns for healthy aging | Nature Medicine https://www.nature.com/articles/s41591-025-03570-5 Intake of trans fatty acids and risk of coronary heart disease among women | The Lancet https://www.thelancet.com/journals/lancet/article/PII0140-6736(93)90350-P/fulltext Consumption of Olive Oil and Diet Quality and Risk of Dementia-Related Death https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2818362 Total and specific potato intake and risk of type 2 diabetes: results from three US cohort studies and a substitution meta-analysis of prospective cohorts https://www.bmj.com/content/390/bmj-2024-082121 Low-Carbohydrate Diets of Varying Macronutrient Quality and Risk of Type 2 Diabetes in Three U.S. Prospective Cohort Studies https://drive.google.com/file/d/1PpnCujBUHwpqAx8dIaa1UIgC3Nh8KSH0/view?usp=sharing FASCINATING CHARTS: Harvard's heat map from optimal diets for healthy aging: https://drive.google.com/file/d/1l7FeZf-K6GjIob7jLNk4QSVururGOZ04/view?usp=sharing Harvard's type of fat vs. mortality: https://drive.google.com/file/d/1dWlaLQ1Kqs4Foe9pRW4zkOnpZoBsqytP/view?usp=sharing EAT Lancet's food guide graphic: https://drive.google.com/file/d/1ngOgEEwu1802licLatkcw4RV0fRtlGsL/view?usp=sharing 0:00 Our journey to obesity 3:21 The leading indicator of population health 7:59 Why we believe in some sciences but not others 11:48 The campaign against EAT Lancet 22:12 Beginning of Dr. Willett interview - Diet 29:31 The best science doesn't get published 30:46 Getting the ban on trans fats 37:47 Is nutritional epidemiology reliable? 42:02 Eat Lancet diet & seed oils 47:33 Environmental aspect of food 50:34 Dr. Willett's critics 1:00:16 My conclusions