Dieting can't play a role in losing weight, but it will be counterproductive. Because the human body's demand for food is neuromodulated and realized through basic metabolism. If the calorie intake is reduced too much, the basal metabolism will be reduced, and the energy consumed will also be reduced, but it is useless. Moreover, when there is not enough food in the stomach, or the density of contents changes too much, the stomach will also have corresponding reflex activity. Either hunger, spasm or nausea, that is, the stomach is in a sub-health state, and then, naturally, it will get sick. Dieting will have other side effects, such as bulimia, such as anorexia, which is even more serious and will never work.