10.2 Hunger and Eating — Why Your Brain Controls What You Eat | Psychology 2e

• Understand why hunger and metabolism are incredibly complex biological systems.
• Learn the physical and chemical signals that trigger the sensation of hunger.
• Discover the multi-layered biological mechanisms that signal fullness and stop eating.
• Identify the brain regions that integrate hunger and satiety signals.
• Define metabolism and critically evaluate the controversial set point theory of body weight.
• Learn about the obesity epidemic, BMI flaws, and health risks of excess weight.
• Explore how socioeconomic status and physical environment influence body weight.
• Understand bariatric surgery as a medical intervention for severe obesity.
• Learn about Prader-Willi Syndrome, a genetic disorder causing insatiable hunger.
• Differentiate between bulimia nervosa, binge eating disorder, and anorexia nervosa.
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This lesson dives deep into the biology, psychology, and environment behind hunger and eating. From the chemical signals that tell your brain to start and stop eating, to the controversial set-point theory of body weight, to the medical and cultural forces shaping eating disorders — there is far more going on than simple willpower. Drawn from Section 10.2 of Psychology 2e, this video untangles the surprisingly complex machinery that governs one of our most fundamental survival drives. In this video: • How stomach contractions and falling blood glucose levels send chemical signals to the brain to trigger hunger • The three-layer satiation system — blood glucose, gastrointestinal stretch signals, and leptin released by fat cells • Set-point theory: what it claims, why it's intuitively appealing, and where the empirical evidence falls short • BMI as a measurement tool: CDC categories explained, plus the 2023 American Medical Association recommendation to retire it as a standard health metric • How socioeconomic factors like food deserts and high-crime neighborhoods contribute to obesity beyond individual willpower • Prader-Willi Syndrome: the leading genetic cause of severe obesity in children and its link to hypothalamic abnormalities • The three major eating disorders — Bulimia Nervosa, Binge Eating Disorder, and Anorexia Nervosa — including their behavioral differences and the interplay of cultural and genetic risk factors #OpenStax #Psychology #HungerAndEating #EatingDisorders #Nutrition OpenStax Content adapted from "OpenStax Psychology 2e", by OpenStax licensed under CC BY 4.0. Content based on Web Version: Apr 23, 2026. Read the textbook online https://openstax.org/details/books/psychology-2e Music first girl talking to me. by ikkun (ex. Barradeen) | https://soundcloud.com/ikkunwastaken Royalty Free Music by https://www.free-stock-music.com Creative Commons / Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en_US