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👇 Visit The Proof website for the full show notes and supporting studies. 👇 https://theproof.com/podcast/ What truly defines a healthy diet, and why does nuance get lost in online nutrition debates? In this episode of The Proof, I’m joined once again by Dr David Katz, physician, nutrition researcher, and internationally recognised leader in preventive medicine. We unpack the science of diet quality, the role of balance, the impact of ultra-processed foods, and why both human and planetary health must be part of the same conversation. David shares lessons from decades of research and clinical practice, including his reflections on the ongoing “diet wars” and how stories can overshadow science on social media. Together, we explore what all healthy diets have in common and how shifting both food demand and food supply is key to solving the chronic disease crisis. What we cover: - Why diet quality is the leading predictor of health and longevity - How to define a truly balanced plate - Why beef is uniquely problematic for human and planetary health - The rise of keto and carnivore diets, anecdotes versus long-term evidence - Ultra-processed foods, what they are and why they drive overconsumption - Supplements, when they help, when they don’t, and what David takes himself - The bigger picture, food environment, policy, and planetary health A powerful conversation that cuts through ideology and helps you make sense of nutrition science in the real world. Timestamps: 00:00:00 The Critical Role of Diet in Chronic Disease and Longevity 00:05:50 What Does a High-Quality Diet Actually Mean? 00:12:54 Why Balance Is the Essence of Diet Quality 00:23:03 What Does a Balanced Diet Look Like in Practice? 00:26:17 Why Should We Eat Less Beef? 00:32:59 Plant-Based vs Omnivore Diets: Which Is Healthier? 00:41:24 Are Keto and Carnivore Diets Healthy Long-Term? 00:50:46 How Can We Fight Nutrition Misinformation? 01:06:28 How Ultra-Processed Foods Hijack Appetite and Drive Overeating 01:16:46 How Do We Tell Good vs Bad Ultra-Processed Foods? 01:25:18 Can Reformulated Ultra-Processed Foods Improve Public Health? 01:33:04 How Measuring Diet Quality Could Transform Public Health 01:37:29 How Diet ID Measures and Improves Diet Quality 01:49:27 Do Supplements Work and Which Ones Are Worth Taking? 01:58:28 Lessons From 40 Years in Medicine and Public Health You can connect with Dr David Katz on:  LinkedIn - https://www.linkedin.com/in/david-l-katz-md-mph-4798667/?utm_source=chatgpt.com  Facebook - https://www.facebook.com/DrDavidKatz?utm_source=chatgpt.com  X (Twitter) - https://x.com/DrDavidKatz?utm_source=chatgpt.com. Subscribe and stay connected: Found this episode valuable? Subscribe to The Proof on YouTube and hit the notification bell to stay updated. Listening on Spotify or Apple Podcasts? Follow the show to ensure you never miss an episode. Support the show: The best way to support the show is to use the products and services offered by our sponsors. Visit http://theproof.com/friends for exclusive discounts. If you have any additional questions you would like answered in the future, let me know in the comments. Enjoy, friends. Simon This episode is brought to you by: 38TERA Consider 38TERA's [DMN prebiotic supplement](https://38tera.com/?ref=SIMON) a daily multivitamin for your gut. Formulated by yours truly and gastroenterologist Dr Will Bulsiewicz. Use code THEPROOF for a discount at checkout. Function Health Take charge of your health with advanced blood testing and personalised insights. Function Health provides a practical solution to track key health markers such as cholesterol, blood sugar, and more. For the first 1,000 listeners, new members get a $100 credit when signing up. Head to https://www.functionhealth.com/simonhill to claim your credit. Only available to those living in the United States. Shopify Shopify, the world's leading e-commerce platform, helps you turn browsers into buyers with the internet’s best-converting check out–up to 36% better compared to other leading e-commerce platforms. To boost your conversion rate, and grow your business, sign up for a one-dollar-per-month trial period at http://shopify.com/proof. Eight Sleep Upgrade your sleep with the Pod 5 Ultra by Eight Sleep. Clinically validated to deliver up to 1 extra hour of quality sleep per night through temperature control and biometric tracking. Use code THEPROOF for $350 off at http://eightsleep.com/theproof. Try it risk-free for 30 days, with worldwide shipping. WHOOP Whoop, the most advanced fitness and health wearable available. Your personalised fitness and health coach to recover faster, sleep better, and train smarter. Claim your first month free on http://join.whoop.com/simon. Simon Hill, MSc, BSc (Hons) - Creator of http://theproof.com/ - Host of https://theproof.com/podcast/ Subscribe & Connect: - YouTube: https://www.youtube.com/c/TheProofWithSimonHill?sub_confirmation=1