Scientists uncover exercise’s secret hunger-busting molecule

Scientists discovered how Lac-Phe, a molecule produced during exercise, reduces appetite and helps with weight loss. This compound inhibits specific hunger-stimulating brain cells (AgRP neurons) by activating KATP channels, which then allows hunger-suppressing neurons to become more active, leading mice to eat less. The mechanism explains why exercise naturally curbs appetite and could potentially be developed into weight management treatments for humans, with research showing the molecule increases in humans, mice, and racehorses after intense physical activity.