Malnutrition is indeed also a major cause of menstrual irregularities, and if a woman weighs less than 40 kg, it can often cause amenorrhea as well. Protein is the raw material for sex promoting hormones and severe malnutrition resulting in protein deficiency can cause hormone deficiency. Vitamin B1 can affect the inactivation of estrogen by the liver, and when vitamin B1 is insufficient, it can cause uterine bleeding because estrogen is not inactivated in time. Vitamin E deficiency also affects ovarian reproductive function and breast dysplasia, calcium deficiency causes dysmenorrhea or premenstrual tension, vitamin A deficiency can cause poorly developed spermatogenic cells, vitamin B12 deficiency can reduce mature sperm and also slow follicle maturation, and zinc deficiency can cause oligospermia or weak sperm. Imagine yourself trying to squeeze through the middle of a crowd; no one can get anywhere quickly in this large group of people. When men are deficient in vitamin C, sperm are in a similar state, and studies have shown that low levels of vitamin C in the body can cause sperm to clump together. As little as 200mg of vitamin C a day can have some effect. A better approach is to eat at least five servings of fruits and vegetables a day, a certain amount of high-quality protein such as meat, fish and milk, and a daily multivitamin and mineral supplement tablet can also be very beneficial.