Some girls who think they are obese, in order to make themselves slim as soon as possible, have taken intensive dieting treatment and restricted their diet very strictly. As a result, in a relatively short period of time, I really lost weight quickly, but I left without saying goodbye every month. Drug therapy takes a lot of energy and financial resources to gradually recover. And most girls don't have correct physiological knowledge, so they don't think so. They even think it's easier not to menstruate. There are also some girls who are embarrassed to explain to others or go to the hospital to see a doctor and delay their illness. In fact, all this is brought about by blind weight loss. According to the analysis of medical experts, within one year, women who suddenly lose more than 5 kilograms or lose more than 10% of their weight often have a sudden change in menstrual regularity and amenorrhea. Some dieters first have amenorrhea and then lose weight. These are the clinical manifestations of anorexia nervosa. There is a hypothalamus in the human brain, which has a feeding center and a satiety center. In addition, the hypothalamus also has an important function, which is to secrete a hormone called luteinizing hormone releasing hormone. The name of this hormone is hard to remember, but don't underestimate its function. Luteinizing hormone releasing hormone can stimulate the pituitary gland to secrete luteinizing hormone and follicle stimulating hormone, and the latter two hormones can stimulate the development of testis or ovary, which is of great significance to menstrual cramps and the production of sperm and eggs. Endocrinologists call this system hypothalamus-pituitary-gonad axis, which is also regulated by cerebral cortex. When people are anorexic or subjectively forced to eat less, the nutritional status of the whole body deteriorates, the weight drops, and the cerebral cortex is dysfunctional. When dieting further, it will affect the function of hypothalamus-pituitary-gonad axis, the secretion of luteinizing hormone and follicle stimulating hormone is insufficient, and the secretion of estrogen and progesterone by ovaries is also reduced, leading to amenorrhea. The vast majority of amenorrhea patients can recover by eliminating the inducement, regaining weight and using ovulation induction drugs. Among them, restoring weight is often the key. It has been observed that when a girl's weight returns to more than 85% of the standard weight, menstruation often recovers on her own. But the longer amenorrhea lasts, the less chance of cure. Therefore, in order to be healthy, weight loss should have a scientific basis.