Understand Obesity
Obesity is a chronic medical condition — not a willpower problem. Over 1 billion adults are affected globally, and the body actively defends its weight using hormones, which is why dieting alone rarely works long-term. Effective treatments address this biology directly.
Quick read · 2 min
What is obesity?
Global prevalence, how BMI is used and its limitations, and what it means to be clinically obese.
Health consequences
How obesity increases risk of type 2 diabetes, heart disease, cancer, sleep apnoea, and other conditions.
Why weight loss is hard to sustain
The biology of hunger hormones, leptin resistance, and why the body actively defends its set point weight.
How treatments work
Plain English explanations of GLP-1, dual agonists, triple agonists, amylin pathway, and oral vs injectable delivery.
Myths vs facts
Common weight loss claims checked against evidence — from berberine to spot reduction to "just eat less."
BMI vs waist-to-height ratio
BMI is everywhere, but where you carry fat may matter more. What the research shows, and a calculator to check both.
Based on clinical trials · No rankings · Every claim linked to source
Last reviewed: April 2026
Why this matters for treatment
Obesity is now understood as a chronic disease driven by hormonal, genetic, and environmental factors. The treatments reviewed on this site — GLP-1 drugs, dual agonists, surgery — work because they directly address these biological mechanisms, not just calorie balance.