First, for weight loss, it is the way of dieting+exercise, and both are indispensable. That kind of sitting thin, lying thin only exists in advertisements, but does not exist in reality. I suggest you take the method of diet and exercise to lose weight. Dieting is not to skip meals, but to eat less and eat more, but not to eat too much at each meal. Even if you eat too much at a meal, you may have energy accumulation. Exercise: It is recommended to exercise at least 5 days a week and at least 1 hour a day, mainly with aerobic exercise, such as jogging, cycling and swimming. And you insist, 3 weeks and 5 weeks can't see too obvious effect, the key is to insist!