New Science of Weight Loss | A Masterclass

GLP-1 medications are transforming obesity treatment, but they're only one piece of the puzzle. In this masterclass, I bring together insights from Dr Terry Simpson, Dr Federica Amati, Dr Mauricio Gonzalez, Dr Christos Mantzoros, and Dr Stephan Guyenet to explain how these medications work, why "food noise" matters, and what it really takes to improve long-term metabolic health. What We Cover How GLP-1 medications regulate appetite and food noise Why obesity is more complex than willpower Semaglutide vs tirzepatide and newer medications Nutrition and resistance training while taking GLP-1s The role of fibre, protein, and Mediterranean-style eating Common misconceptions and side effects I hope this episode helps you better understand both the promise and the limitations of GLP-1 medications, while highlighting the importance of lifestyle alongside any medical treatment. Why Terry Simpson Started Taking a GLP-1 (00:00) What Is Food Noise, Really? (04:59) Why GLP-1 Drugs Work So Well (10:16) What Actually Causes Obesity (17:37) How GLP-1 Medications Work in the Body (21:22) The Strange Lizard Behind GLP-1 Drugs (25:56) 3 Types of Hunger You Didn't Know About (28:41) How to Naturally Boost Fullness Signals (37:08) How Doctors Choose Which GLP-1 to Prescribe (45:10) Why Some People Don't Respond to GLP-1s (53:09) GLP-1 Side Effects, Guilt, and Eating Right (58:12) Mediterranean Diet's Effect on Long-Term Weight Loss (01:10:29) The Shame Around Taking GLP-1 Medications (01:20:00) Being Called a Pharma Shill (01:32:39) The History Behind GLP-1 Drugs (01:38:18) Will You Need GLP-1s Forever? (01:47:04) Want to support the show? The best way to support the show is to use the products and services offered by our sponsors. To check them out and enjoy great savings, visit theproof.com/friends. You can also support the show by leaving a review on the Apple Podcast app and sharing your favourite episodes with friends and family. This episode is brought to you by: 38TERA Consider 38TERA's DMN prebiotic supplement a daily multivitamin for your gut. Formulated by yours truly and gastroenterologist Dr Will Bulsiewicz. Use code THEPROOF for a discount at checkout. 38Tera ships to the United States, Australia, and New Zealand. 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 at eightsleep.com/theproof for up to $350 off. You get 30 days to try it at home and return it if you don't love it. Eight Sleep ships to the U.S. (excluding Alaska, Hawaii, and territories), Canada, Mexico, most of the EU, the U.K., Australia, the UAE, Saudi Arabia, and Switzerland. ProLon ProLon’s 5-Day Fasting Mimicking Diet is a science-backed, plant-based program designed to support metabolic health while keeping your body in a fasting-like state. Get 15% off sitewide plus a $40 bonus gift at ProLonLife.com/THEPROOF. ProLon ships within the United States. SwimClub SwimClub is a science-backed supplement designed to support male fertility, sperm health, and reproductive wellness. Head to swimclub.co to get 25% off your first order with code THEPROOF. Function Health Take charge of your health with advanced blood testing and personalised insights. Function Health offers a practical way to track key health markers such as cholesterol, blood sugar, and more. Learn more and join at functionhealth.com/simonhill for a $25 credit toward your membership. Only available to those living in the United States. Function Health ships to 48 U.S. states, excluding Rhode Island, Hawai‘i, and Puerto Rico. 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 join.whoop.com/simon. Whoop ships to 56+ international markets, including the US, Canada, most of Europe, Australia, New Zealand, UAE, Singapore, and parts of Asia. Simon Hill, MSc, BSc (Hons) Creator of theproof.com Host of The Proof with Simon Hill Author of The Proof is in the Plants Subscribe & Connect: YouTube Apple Podcasts Spotify Instagram: @simonhill Twitter: @theproof Facebook: The Proof with Simon Hill Nourish your gut with my Plant-Based Ferments Guide and download my Two-Week Meal Plan.