I don't think your method is appropriate. Because everyone's physical condition, system and life rules are different, we can't generalize. Like you said, it will do harm to the body. In fact, losing weight and shaping is not a matter of a few days, there is always a process. Excessive weight loss and diet control can cause hypoglycemia. As we all know, hyperglycemia will not cause temporary death, but hypoglycemia will cause instant death. My groping experience tells me that you lose weight by eating more calories every day, but exercise has little effect on losing weight, at most, it accelerates the circulation of the body. A balanced diet is the last word. I hope my answer can help you!