It is very normal for water to be retained during the premenstrual period causing weight gain because the metabolism will be significantly accelerated during the menstrual period, or eaten to regulate menstruation, this is because the body’s progesterone is at work. If you are not pregnant or physiological period to the hormone levels will drop, will inevitably produce a certain result, every cell in the body will lock more water, so will not really cause weight gain, but will cause bloating in the abdomen will feel weight gain, in fact, the change is very small. When the menstruation went down immediately, pre-menstrual weight gain do not worry too much, as long as you pay attention to the menstrual diet, do not eat spicy, cold things, do not overeat, pay attention to the menstrual diet hygiene, as long as you control the weight after the month will not have much effect.