You can eat cake during menstruation because: First, women lose blood during menstruation and lose nutrients, such as sugar, fat, protein, vitamins and amino acids. Women should increase the intake of nutrients during menstruation, and cake contains certain protein, fat, vitamins and amino acids. Secondly, some women may experience nausea, vomiting, indigestion and other digestive system reactions during menstruation due to mood swings, and cake is a sweet food.