You can lose weight moderately during menstruation. It should be noted that female friends must not lose weight through dieting or strenuous exercise during menstruation, otherwise they will not lose weight, but will have other serious adverse effects. The menstrual diet is also called physiological diet. According to the physiological cycle, slimming is divided into four stages, namely, 1-7 days after menstruation is called slimming welfare period, 7- 14 days after menstruation is called slimming overspeed period, 14-2 1 day after menstruation is called slimming plateau period, and 28 days after menstruation is called slimming buffer period.