Cambridge Weight Loss Scientist: Your Brain Fights Weight Loss! How To Keep It Off | Prof Giles Yeo

Professor Giles Yeo MBE has spent 30 years studying one of the most misunderstood questions in health: why some people feel hungrier, gain weight more easily and find it much harder to keep weight off than others. He is Professor of Molecular Neuroendocrinology at the University of Cambridge, where his research focuses on how our genes, hormones and brain control appetite and body weight. In 2026, he was elected a Fellow of the Academy of Medical Sciences for his internationally recognised work on the genetics and neuroscience of obesity. And one of his central messages challenges the way many of us think about weight. Two people can be faced with exactly the same food, but experience very different levels of hunger, fullness and reward. Your biology does not remove personal responsibility, but it can dramatically change how difficult the same decision feels. In this episode, you will learn: • Why your brain actively fights weight loss, increasing hunger and changing your metabolism when you lose weight • Why two people can eat the same food but experience completely different levels of appetite and food noise • What calories fail to tell you about food, and why protein, fibre and ultra-processed foods affect your body differently • How Ozempic and other GLP-1 drugs actually work, why weight often returns after stopping them, and the risks people need to understand • Giles's simple 16:30:5 framework for eating enough protein and fibre to lose weight while reducing free sugar without obsessing over individual meals Giles also speaks personally about his son's experience with obesity and GLP-1 medication, and admits that even after spending his career studying obesity, he still had to fight the human instinct to blame. Key moments: 00:00:00 – Why 95% of Diets Fail 00:01:40 – What is Molecular Neuroendocrinology? 00:04:33 – Discovery of the MC4R Fat-Sensing Gene 00:07:37 – Redefining Obesity: Beyond BMI 00:10:00 – How to Measure Your True Metabolic Health 00:13:32 – The Appetite Triangle: Hunger, Fullness & Reward 00:17:42 – Genetics of Food Preference: Fat vs. Sugar 00:23:05 – Supertasters, Bitterness & Vegetable Preferences 00:26:37 – Quirky Genetic Traits: Asparagus & Coriander 00:28:05 – Gut Hormones vs. Fat Hormones 00:29:38 – Leptin: The Starvation Alarm in Your Brain 00:33:31 – The Melanocortin Pathway & "Food Noise" 00:36:15 – Genetics vs. Personal Willpower 00:38:14 – Twin Studies: How Much Weight is Genetic? 00:41:52 – The Science of Ultra-Processed Foods 00:47:50 – Caloric Availability: Whole Foods vs. Processed Foods 00:50:45 – Why We Stress Eat (and the Dopamine Loop) 00:54:06 – Why Your Brain Fights Weight Loss 00:57:04 – Living in a Toxic Feast-Feast Environment 01:01:27 – Why Calories Don't Count 01:05:10 – The History of the Calorie & Wilbur Atwater 01:08:46 – Why Protein Keeps You Fuller for Longer 01:10:54 – How GLP-1 & GIP Weight Loss Drugs Actually Work 01:16:02 – Are Weight Loss Injections "Forever Drugs"? 01:18:02 – Side Effects, Risks & Muscle Mass Loss 01:22:44 – Who Should Never Take Weight Loss Drugs 01:24:00 – The 16:30:5 Nutrition Framework 01:27:11 – Why You Should Plan Nutrition Weekly, Not Daily 01:28:10 – Prof Giles Yeo on His Son's Battle with Weight 01:32:23 – Advice for Anyone Struggling to Lose Weight 01:34:36 – The #1 Secret to Long-Term Health: Variety Follow Prof Giles Yeo:   / giles-yeo-2062969     / gilesyeo     / giles.yeo   #ThrivingMinds #AlbertoZandi #GilesYeo #Neuroscience #AppetiteScience #BrainHealth #WeightLoss #HungerHormones #NutritionScience #ObesityResearch #HealthPodcast #MetabolicHealth #FoodScience