Scientists explain why the body regains weight after slimming

Scientists have uncovered why many people regain weight after losing it, revealing a complex interplay of the brain, hormones, genetics, and environment. The human body can perceive significant weight loss as a survival threat. In response, it increases hunger, drives cravings for high-calorie foods, and reduces energy expenditure, making it harder to maintain a lower weight.

This biological mechanism, developed during times of food scarcity, now works against individuals in environments with easy access to calorie-dense foods and sedentary lifestyles. Researchers suggest the brain may establish a higher previous weight as a 'reference point.' When weight loss occurs, the body activates appetite-stimulating and energy-conserving processes to compensate, often leading to weight regain even without returning to old eating habits.

Medications like Wegovy and Mounjaro mimic gut hormones to signal fullness to the brain, aiding weight loss. However, these drugs don't work for everyone, and some patients stop treatment due to side effects or insufficient results. Crucially, when treatment ends, the biological mechanisms that regulate appetite can reactivate, causing weight to return. Future therapies aim not just to suppress appetite but to permanently alter the brain's inclination to revert to a higher weight.

Experts also emphasize that health is more than just a number on the scale. Regular physical activity, balanced nutrition, adequate sleep, and mental well-being offer significant cardiovascular, blood sugar, and metabolic benefits, regardless of weight fluctuations. Instead of drastic, short-term diets, sustainable lifestyle habits like regular walking, consistent sleep, and dietary variety are recommended for long-term weight management and overall health.