Only by exercising and reducing fat is the healthiest. If you do aerobic exercise 1 hour every day, just make sure you lose fat this hour. At other times, you must have enough calories to lose weight by dieting. All the weight you've lost is water and protein. Moreover, in the process of dieting, the body will automatically reduce metabolism because of insufficient calories. It is even more difficult to lose fat at this time. If you go on an excessive diet and keep exercising, the hospital is the place you should go next time.