Dieting to lose weight will rebound after resuming diet, which is harmful to the body. The harm is determined by the intensity of dieting, and some people don't even come to their period every month.

Exercise to lose weight has a small chance of rebounding, and it can also have the effect of body shaping while losing weight, and will not cause harm to the body (excessive exercise or improper exercise mode may also cause harm, so it is necessary to exercise scientifically).