Children and adolescents who are deficient in zinc during growth and development can suffer from stunted growth, imbalance of intestinal flora, and, in severe cases, mental retardation. Adult male zinc deficiency will also affect the quality of sperm, serious infertility. The best, fastest and safest way for men to supplement zinc is to eat more zinc-containing foods, such as oysters and egg yolks, which are not only tasty but also rich in nutrients and zinc. Animal liver is also rich in zinc, like pig liver, chicken liver, duck liver, etc. You can also eat more lean meat, fish, sesame seeds, walnuts, beans, millet and other foods.