During menstruation, women are in the stage of water and sodium retention. With the gradual end of menstruation, the water in women's bodies will gradually decrease, and with the discharge of menstrual blood, their weight will gradually decrease. After menstruation, the body's metabolism is relatively fast, which is the golden period of weight loss. Reasonable diet and aerobic exercise are helpful to accelerate metabolism and fat consumption in the body, thus achieving the effect of losing weight.