Studies have shown that a body weight below 10-15% of normal body weight or a low percentage of body fat can interfere with normal estrogen levels, thus interfering with normal menstrual formation and cycles. For a normal woman around 18 years old, body fat should be at least 23% of body weight, which is the minimum level of fat for future pregnancy, childbirth and breastfeeding. If it is lower than this level, it is easy to cause primary amenorrhea, premature ovarian failure, etc., affecting fertility. Recently in Suzhou, a 1.7-meter-tall 90-year-old girl, due to weight loss from high school, resulting from last year’s Fourth of July to April this year, the weight from 90 pounds to 78 pounds, as thin as a bone. Currently, 400,000 yuan has been spent on nutritional supplements and weight gain and other related treatments, however, the effect is not significant, and habitual constipation, and even the phenomenon of menopause. Women who have experienced weight loss may want to ask why weight loss can lead to menopause, and what kind of connection exists between them? When a woman reaches puberty, the pituitary gland will secrete a large amount of luteinizing hormone and follicle stimulating hormone, resulting in the maturation of the follicles, ovulation and menstruation. Menstruation requires a certain amount of fat. Fat is the main source of estrogen, and only when estrogen is normal will menstruation occur as scheduled. Therefore, women should not lose weight blindly, including excessive dieting, but also including too much intensity, concentrated, strenuous exercise, such as long-distance running and sprinting athletes, ballet practitioners, are prone to lead to the loss of body fat, the occurrence of menstrual disorders or secondary amenorrhea. It has also been clinically found that the majority of patients with amenorrhea due to dieting and weight loss can recover by resuming their diets and gaining weight, but a quarter of them need therapeutic recovery with the help of ovulation-promoting drugs. Of course, it does not exclude hard-to-cure amenorrhea caused by prolonged amenorrhea. Tips: Amenorrhea does not only occur in adult women, but also in adolescent girls due to the imperfect development of ovarian function or artificial blind weight loss and unrestricted overeating may induce amenorrhea, which, if not detected in time and without proper treatment, may affect future fertility.