Weight gain is expected during menstruation. Generally, within 2 weeks after the end of menstruation, metabolism is relatively fast and sodium and water retention in the body is slow, so there will be no weight gain. About 7-10 days before menstruation, during the period when the body metabolism is slower, influenced by the ovarian secretion function, hormone levels, sodium and water retention, will be manifested as weight gain relative to the usual weight, can be appropriate exercise to lose weight. Weight gain is also related to diet, such as eating high-fat, high-calorie foods, such as large fish and meat, which can also lead to weight gain during menstruation. To lose weight under normal circumstances, you should usually eat less and exercise more. During menstruation, weight may be increased by physiological effects, but the increase will not be significant.