In this episode I discuss what drives hunger and satiety, and the role our brain, stomach, fat and hormones play in regulating hunger and turning off the desire to eat more. I also address how protein is assimilated better early in the day than it is later in the day, and why those using intermittent fasting might want to shift their feeding window to earlier in the day. Then I delve into the topic of disorders of eating: Anorexia Nervosa, where people starve themselves and Bulimia Nervosa where people binge and purge their food. I discuss some common myths about Anorexia such as the role of media images increasing the rates of anorexia and the myth of the "perfectionist" anorexic. I also review the symptoms, and the brain and chemical systems disrupted in this condition. I explain how anorexics become hyperaware of the fat content of foods and develop reflexive habits of fat-hyperawareness. Then I discuss the most effective treatments ranging from family-based models to those that target the habitual nature of low-fat/calorie food choices. I also discuss new more experimental clinical trials on MDMA, Psilocybin and Ibogaine for Anorexia, and both their promise and risks. I review the latest work on binge eating disorder and brain stimulation, drug treatments and thyroid disruption in Bulimia and why the treatments for Bulimia are so similar to those for ADHD. Finally, I discuss "cheat days, body dysmorphia and the growing list of novel forms of eating disorders starting to surface. As always, science and science-based tools are discussed.   Thank you to our sponsors: Belcampo - https://www.belcampo.com/huberman -- code "huberman" Headspace - https://www.headspace.com/specialoffer Athletic Greens - https://www.athleticgreens.com/huberman   Support Research in Huberman Lab at Stanford: https://hubermanlab.stanford.edu/giving   Our Patreon page: https://www.patreon.com/andrewhuberman   Supplements from Thorne: http://www.thorne.com/u/huberman   Social: Instagram - https://www.instagram.com/hubermanlab Twitter - https://twitter.com/hubermanlab Facebook - https://www.facebook.com/hubermanlab Website - https://hubermanlab.com Join Newsletter - https://hubermanlab.com/neural-network   Links: Ingesting Protein in the Morning Supports Muscle Maintenance & Growth: https://www.cell.com/cell-reports/fulltext/S2211-1247(21)00712-9 Studies Using Virtual Reality to Explore Eating & Hunger & Body Image: https://www.stanfordvr.com/pubs/2018/exploring-the-influence-of-haptic-and-olfactory-cues-of-a-virtual-donut-on-satiation-and-eating-behavior/ https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0163921   Timestamps: 00:00:00 Introduction: Fasting, & Defining Healthy Eating 00:08:55 Morning Protein Is Important  00:22:04 Sponsors 00:26:29 Defining & Diagnosing Eating Disorders 00:29:00 Anorexia Nervosa (Overview & Myths) 00:33:44 Bulimia (Overview & Myths) 00:37:35 Binge Eating Disorders, EDNOS, OSFEDS, Pica 00:39:44 What is Hunger? What is Satiety? 00:42:00 Neuronal & Hormonal “Accelerators & Brakes” on Eating 00:46:17 Fat, Leptin & Fertility & Metabolic Dysfunctions in Obesity 00:50:30 Why We Overeat 00:55:30 Homeostasis & Reward Systems/Decisions  00:59:58 Anorexia 01:04:28 The Cholesterol Paradox 01:06:13 Psychological vs. Biological/Genetic Factors in Anorexia 01:09:44 Chemical Imbalances, Serotonergic Treatments 01:12:56 Altered Habits & Rewards in Anorexia: Hyperacuity for Fat Content 01:18:28 Brain Areas for Reward Based Decision Making vs. Habits 01:24:06 Habit-Reward Circuits Are Flipped in Anorexics: Reward for Deprivation 01:28:30 How Do You Break a Habit?  01:33:23 Family Based Models, Cognitive Behavioral Therapy 01:35:39 MDMA, Psilocybin, Clinical Trials, Ibogaine  01:40:35 Anabolic vs. Catabolic Exercise, Spontaneous Movements, NEAT 01:43:23 Distorted Self Image in Anorexia  01:47:54 Bulimia & Binge-Eating, “Cheat Days”, Thyroid Hormone 01:53:05 Inhibitory Control, Impulsivity, Adderall, Well