During menstruation if you eat the same as you normally do, it does not usually lead to weight gain. If a woman eats more during her period, such as sweets or foods with more fat, and lacks exercise, she will gain weight during her period. In most cases, women experience a loss of appetite during menstruation and may eat less food due to a low immune system and easy fatigue, so it does not lead to fattening. If women do not have any discomfort during menstruation, such as no lower abdominal pain, no more vaginal bleeding, and eat more and lack of exercise, they can also gain weight normally, which is about 1000-1500g during menstruation. Women should eat properly during menstruation to maintain the body’s nutrition and consumption, which is conducive to the normal conduct of menstruation.