Eating during menstruation won't make you fat. Don't worry, you must pay attention to strengthening nutrition during menstruation, otherwise it will easily lead to anemia and malnutrition. As for the safety of eating a few days ago, it is calculated according to your own physiological cycle. I don't know your cycle ~ If you eat it regularly, progesterone secreted by your body can promote the relaxation of gastrointestinal smooth muscle, reduce the secretion of gastric acid and pepsin, delay gastric emptying, prolong gallbladder emptying time, weaken intestinal peristalsis, etc., which will reduce absorption. I usually start dieting after the menstrual cycle, and exercise will get twice the result with half the effort. I often do this ~ ~ ~

I hope my sincere answer can be adopted by you ~ ~ ~