About a third of the world's population is overweight or obese, and the number keeps growing. Obesity can cause various illnesses, including diabetes and heart problems. Japan has led the world in recognizing obesity as a disease, and has been highly successful in helping many people lose weight and regain their health. The approach relies on a well-organized team effort involving different specialists. Their aim is not just to treat obesity, but to improve patients' lifestyle and their psychological health.