The menstrual period is not suitable for the Pioneer Valley, grains contain a lot of carbohydrates, Pioneer Valley refers to not eating grains, is a method of weight loss and fat loss, and the menstrual period is a special period for women, easily stimulated by external factors, including dietary factors. The menstrual period due to blood loss should be properly enhanced diet nutrition, if you do not eat cereals during the menstrual period, it may cause hypoglycemia and slow metabolism, inhibit the feedback of the hypothalamic-pituitary-ovarian axis, so that the menstrual volume is reduced, or even menopause, in addition to dietary calorie deficiency, it will lead to metabolic disorders in the body, slowing down the blood flow, which can cause poor flow of menstrual blood, abdominal pain and other conditions. If you need to lose weight you should try to do it during the non-menstrual period, and during the period you should eat carbohydrates appropriately to ensure the normal function of the body and avoid affecting your menstruation due to dieting.