Eating normally during the period, i.e., menstruation, does not usually make a person gain weight. During menstruation the pelvis becomes congested and there may be discomfort in the lower abdomen, or lower back pain. There may also be digestive symptoms such as diarrhea, constipation, or changes in appetite. However, menstruation does not usually affect digestive function, so eating normally during menstruation does not usually make a person gain weight. However, during menstruation, due to the relative increase in estrogen secretion, as well as the shedding of the uterine lining will take away a large amount of water, electrolytes, proteins, so the human body also needs more calories and nutrients to maintain normal activities, which will increase the appetite to a certain extent, may lead to weight gain, while the normal eating itself will not cause weight gain. It is recommended that during menstruation, more fresh vegetables and fruits are eaten to replenish nutrients, and appropriate activities can be done at the same time.