The main reason for breast enlargement during menstruation is that the level of estrogen and progesterone in the body changes during menstruation, and these hormones act on women’s breast tissue, which accelerates blood circulation in the breast area and makes it easier for various nutrients to reach the breast area and facilitate the development of breast tissue. 1. It is usually believed that foods rich in collagen, such as pig feet, pig skin, chicken feet, etc., have a better effect on breast enlargement; 2. Foods containing plant flavonoids are also considered good for breast enlargement, such as Pueraria Mirifica, papaya, soy products, royal jelly, etc. But in fact, the size of the breast is mainly influenced by genetic factors and puberty development. For women who have already entered adulthood, even if these methods are taken during menstruation, they will not produce significant breast enlargement results.