Most replayed moment: The hormone that controls your weight | Dr Andrew Jenkinson

Leptin functions as the primary hormonal regulator of human weight, signaling the hypothalamus to adjust appetite and metabolism based on energy storage levels. When insulin levels remain chronically elevated due to diets high in sugar, refined carbohydrates, and frequent snacking, the leptin signal becomes blocked. This state of leptin resistance causes the brain to falsely perceive a famine, leading to inappropriate hunger signals and a suppressed metabolic rate. Obesity often manifests as a symptom of this hormonal dysfunction rather than a character flaw. Sustainable weight management requires resetting the body's weight set point by eliminating sugar, adopting a three-meal-a-day structure without snacking, and prioritizing whole foods. Additionally, managing stress-induced cortisol and ensuring quality sleep are essential for normalizing insulin and restoring the brain's ability to accurately sense leptin levels.