Forward QI-Module 2: Pathophysiology of Obesity: Appetite Dysregulation, and Metabolic & Hormonal Adaptation

Module 2: Pathophysiology of Obesity: Appetite Dysregulation, and Metabolic & Hormonal Adaptation

Video Transcription

Video Summary

Dr. Stacey Chronister reviews 2023 updates on obesity pathophysiology, emphasizing that weight regulation is more complex than “calories in, calories out.” Energy expenditure includes resting metabolic rate (largest component), physical activity (including NEAT), and the thermic effect of food. Obesity reflects dysregulated energy homeostasis influenced by genetics and environment, mediated through gut-brain signaling via hormones from adipose tissue, liver, pancreas, and the GI tract. Appetite is regulated through homeostatic signals (ghrelin drives hunger; multiple gut hormones promote satiety), hedonic/reward eating (dopamine/opioid/cannabinoid pathways), and executive decision-making. In the hypothalamus, hormones shift balance between weight-gain (NPY/AgRP) and weight-loss (POMC/CART) pathways, which inhibit each other. Enlarged adipocytes increase leptin resistance and inflammation (adiposopathy), contributing to cardiometabolic disease. Calorie restriction triggers metabolic and hormonal adaptation—lower resting metabolic rate, higher ghrelin, lower satiety hormones—promoting weight regain. A key message: “obesity protects obesity,” and relapse after weight loss has a strong physiological basis.

Meta Tag

Domain Professional Care

Profession Other

Subject Matter Preventative Care

Keywords

obesity pathophysiology 2023

energy homeostasis and metabolic adaptation

gut-brain axis appetite regulation

hypothalamic NPY AgRP POMC CART pathways

leptin resistance adiposopathy inflammation

ghrelin satiety hormones weight regain

Professional Care

Other

Preventative Care