A Neuroscientist Breaks Down GLP–1s, Genetics & the Real Science of Fat Loss | Zachary A. Knight

Why is losing weight—and keeping it off—so difficult? A leading neuroscientist explains the biology of hunger, the rise of GLP-1 medications, and what science is revealing about the brain's role in body weight regulation. In this episode of The LIVING Room Podcast, Chris Wharton sits down with Dr. Zachary A. Knight, PhD — Professor of Physiology at UC San Francisco, Howard Hughes Medical Institute Investigator, and one of the world's leading researchers studying the neural circuits that regulate hunger, thirst, and body weight. Drawing from decades of research, Dr. Knight explains why body weight is influenced by far more than motivation alone, how genetics and environment interact to shape appetite, what happens in the brain when we lose weight, and why GLP-1 medications have transformed obesity treatment. Watch this episode to learn: • Why maintaining weight loss is so challenging for many people • How genetics and environment work together to influence body weight • What happens in the brain when you're hungry—and when you're full • How GLP-1 medications like Ozempic, Wegovy, and Mounjaro affect appetite and food-related reward signals • The science behind "food noise" and why many patients report it decreases on GLP-1s • Whether weight-loss medications are likely to be lifelong treatments • Practical, science-backed ways to increase satiety and better manage hunger • What researchers are learning about hydration, thirst, and the body's internal regulation systems • Where the next generation of obesity and metabolic health treatments may be headed This isn't diet advice. This is the neuroscience of hunger — and it will completely change how you think about your body. Connect with Dr. Zachary A. Knight: https://knightlab.ucsf.edu/   / zachary-knight-29a37977   https://x.com/zaknight Want more? Each month, we send a newsletter curated by our scientific council on what's actually advancing the science of human longevity — and what isn't. Subscribe at https://www.thewndrlab.com/mailing-list. The WNDR Lab: https://www.thewndrlab.com/ Timestamps: 00:00 Why hunger is harder to control than willpower 07:25 Do genetics determine your body weight? 12:15 Why calories alone don't explain weight loss 17:30 How GLP-1 drugs change appetite signals in the brain 29:02 What GLP-1 drugs do to lean muscle mass 41:04 Why some scientists are questioning weight loss drugs 48:07 Simple strategies to manage hunger and hydration 01:05:51 Temperature regulation and metabolic health #GLP1 #Ozempic #Wegovy #Mounjaro #Semaglutide #WeightLossScience #Neuroscience #MetabolicHealth #ObesityResearch #HungerScience