Forward QI-Module 3: Pathophysiology of Obesity: Genetics, Environmental, and Social Causes

Module 3: Pathophysiology of Obesity: Genetics, Environmental, and Social Causes

Video Transcription

Video Summary

Dr. Robert Kushner introduces a module on obesity pathophysiology, emphasizing that obesity is a disease marked by energy dysregulation, largely driven by appetite signals from adipose tissue, the GI tract, and the brain, along with medications and environmental food cues. BMI is commonly used to classify obesity but does not reveal underlying causes. Energy expenditure includes basal metabolic rate, physical activity, and the thermic effect of food. Genetics strongly influence body weight, with obesity heritability estimated at 40–70%. Rising obesity rates are attributed less to genetic change and more to an increasingly “obesogenic” environment that amplifies risk in genetically predisposed individuals. The module distinguishes rare, severe early-onset monogenic obesity (e.g., leptin or MC4R pathway defects affecting satiety/hunger circuits) from common polygenic obesity, where many small-effect variants interact with environment. Epigenetics, sex-based fat distribution, social determinants (income, education, food insecurity), chronic stress (allostatic load), and sleep deprivation further contribute to obesity risk.

Meta Tag

Domain Professional Care

Profession Nurse

Subject Matter Theory

Keywords

obesity pathophysiology

energy dysregulation

appetite regulation signals

BMI classification limitations

genetic heritability polygenic vs monogenic obesity

obesogenic environment and social determinants

Professional Care

Nurse

Theory