Full show notes: http://bengreenfieldlife.com/nicknorwitz Can an Oreo diet lower cholesterol? And what if adding carbohydrates drops low-density lipoprotein (LDL)—the cholesterol-carrying particle tied to cardiovascular risk—more than a statin? That’s the paradox Dr. Nick Norwitz uncovered in one of the most talked-about self-experiments in nutrition science, where Oreo cookies became the unlikely centerpiece of a lesson in metabolic physiology. In this episode, I sit down with Nick—an MD/PhD researcher with deep expertise in metabolism, lipids, and cellular biochemistry—to unpack the mechanisms behind LDL spikes in lean, insulin-sensitive individuals, the truth about seed oils, and why online nutrition debates so often miss the real story. We cover: - Lean mass hyper-responders—why LDL rises sharply in a minority of low-carb eaters, and why this response isn’t explained by “more fat = more cholesterol” - Ketogenic nuance—how BMI, insulin sensitivity, and fuel partitioning influence lipid changes far more than saturated fat alone - Seed oils, omega-6s, and metabolic context—when these fats can be problematic, when they’re benign, and how variables like adiposity and inflammation shape the response - Cold exposure + fatty acid metabolism—how thermogenesis influences omega-6 pathways and what Nick learned from his sardine experiment - Oxidation, processing, and real-world food choices—the difference between theoretical risk and practical application Nick brings a rare blend of rigorous academic training and clear, nuanced communication—and this episode goes far beyond headlines, dogma, or oversimplified “good vs. bad” nutrition takes. LIFE Network: https://joinlifenetwork.com Ben Greenfield Life Website: https://bengreenfieldlife.com/ Ben Greenfield Life Podcast: https://bengreenfieldlife.com/podcast/ Ben Greenfield Books: https://shopbengreenfieldlife.com/collections/books Instagram https://www.instagram.com/bengreenfieldfitness/ Facebook https://www.facebook.com/BGFitness X https://twitter.com/bengreenfield TikTok https://www.tiktok.com/@bengreenfield 00:00 "Making Science Understandable Through Stories" 05:19 "LDL Variability in Low-Carb Diets" 09:42 "Oreo Cholesterol Experiment Spotlight" 11:23 Academics vs. Influencers 15:58 "Diet vs Statins for LDL" 19:02 "Debating Seed Oils Narratives" 21:27 "Omega 6 Oils: Harmful Nuances" 25:24 Overthinking Healthy Food Choices 27:32 "Choose Raw Nuts for Health" 32:42 "Risks of Processed Heated Oils" 34:43 Challenges in Funding Food Research 39:26 "Cold Exposure Boosts Heart Health" 43:20 "Omega-3 Supplements vs. Fish" 45:20 "Processed Oils & Health Risks" 48:31 "Passion Shift in Medicine" 50:50 "Redefining Medicine Through Innovation" 54:22 Mind-Body-Spirit Optimization Focus