1. Genetic factors;

2. diet;

3. Living habits (exercise).

Walk more, run more, swim more, eat reasonably, have a full breakfast, eat well at lunch, eat less at dinner, eat more fruits, vegetables and nuts, eat less chicken, duck and fish, eat more coarse grains and eat less flour and rice. It will be effective if it lasts for 2 or 3 months. You can't be lazy and lose weight without rebounding. The important thing is persistence. Reasonable diet+moderate exercise = the best weight loss effect.