Nutrition Scientist Dr. Federica Amati: Why It's So Hard to Lose Weight and Keep It Off

Visit The Proof website for the full show notes and supporting studies: https://theproof.com/podcast/ Simon's personal supplement stack: https://hub.theproof.com/supplements GLP-1 medications have transformed how we think about obesity and metabolic disease. But most of the conversation focuses on the drugs themselves, not the biology they operate within. In this episode, I sit down with Dr Federica Amati to explore what GLP-1 actually is, how appetite and satiety really work, and what the science of hunger means for all of us, whether we're on medication or not. Dr Federica Amati is the Head Nutritionist at ZOE, holds a PhD in Clinical Medicine Research from Imperial College London, a masters in public health, and is the author of the Sunday Times bestseller Every Body Should Know This. Her new book, The Appetite Reset, is out in June 2026. In this episode we cover: - The biology of GLP-1: how the natural peptide lasts minutes while the drug version lasts days, and the Gila monster origin story - Why supplements claiming to boost GLP-1 naturally don't replicate what the medications do - The three types of hunger (hedonic, homeostatic, and microbiota-driven) and how to distinguish them in practice - The four phases of satiety and why meal quality, not calorie restriction, is the foundation of lasting satisfaction To connect with Dr Federica Amati, follow her on Instagram at https://www.instagram.com/dr.fede.amati?utm_source=ig_web_button_share_sheet&igsh=ZDNlZDc0MzIxNw==⁠ or explore her work through ZOE at ⁠https://zoe.com⁠⁠. Her new book, ⁠The Appetite Reset⁠⁠, will be released on June 25 and is available to pre-order now: https://shor.by/fP5H 00:00 Intro 01:14 Why Everyone Needs to Understand Appetite Biology 03:06 How Dr. Federica Amati Became a Nutrition Expert 11:29 Why GLP-1 Drugs Are Different From Any Supplement 17:44 The Gila Monster That Led to Ozempic 20:20 What Is Food Noise and Why It Controls You 24:06 Why Willpower Isn't the Problem: Genetics and Epigenetics 30:54 How GLP-1s Change Your Relationship With Food and Joy 34:08 Lowest Effective Dose: Why More Isn't Better 39:34 The Muscle Loss Risk Nobody Warns You About 41:59 Microdosing GLP-1s: Does It Work or Is It Dangerous 44:51 The Three Types of Hunger and How to Tell Them Apart 50:17 How Your Gut Microbes Drive Cravings and Leptin Resistance 58:07 Why Calories Alone Don't Explain Appetite 01:04:46 How to Manage Food Noise Without a GLP-1 01:11:09 Prehab Before GLP-1s 01:13:56 The Fiber, Fat, and Gut Prep Protocol for GLP-1 Users 01:21:41 What Clinical Trials Actually Include That Real-World Use Doesn't 01:27:15 Do You Need Supplements on a GLP-1? 01:29:49 Obesity Is Not a Lifestyle Choice: Shame, Stigma, and GLP-1s 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. Head to https://38tera.com/?ref=SIMON and 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 for $350 off at http://eightsleep.com/theproof. Try it risk-free for 30 days, with worldwide shipping. 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. LMNT Stay hydrated with LMNT. Get a free Sample Pack of LMNT’s most popular drink mix flavors with any purchase at http://drinklmnt.com/SIMON. Find your favourite LMNT flavour, or share with a friend. And if you don’t like it? Full refund, no questions asked. LMNT ships to the U.S. and Canada, with sparkling flavors available only in the contiguous U.S. 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 https://www.shopify.com/proof. Pique Pique’s Nandaka combines fermented Pu’er tea, full-spectrum Reishi, ceremonial cacao, and L-theanine for calm, sustained energy without the coffee crash. Unlock 20% off and establish your powerful foundation for sustained well-being at http://piquelife.com/simon. Pique ships within the U.S. and to Australia, Canada, and select EU countries. 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. WHOOP ships to 56+ international markets, including the US, Canada, most of Europe, Australia, New Zealand, UAE, Singapore, and parts of Asia.