Zinc is an essential trace element, second only to iron in the human body. Zinc plays an extremely important role in growth and development, immune regulation and vitamin utilization in the human body, and is involved in the composition of coenzymes, which are tissue components of zinc-containing metalloenzymes and zinc finger proteins, so many coenzymes contain elemental zinc. These coenzymes are involved in the metabolism of many substances and play an important role in promoting growth and development and tissue regeneration, immune regulation, antioxidation, anti-apoptosis and anti-inflammation. Zinc deficiency can cause stunted growth, mental retardation, dermatitis, slow wound healing, hair loss, neuropsychiatric disorders and other diseases. Zinc also has the function of maintaining the normal appetite of the body. Zinc deficiency can lead to loss of taste and patients suffer from anorexia, paranoia, dysbiosis of intestinal flora and digestive disorders, so it is important to prevent and treat zinc deficiency. Zinc is widely found in food, especially in meat, nuts, beans and other foods. The diet should pay attention to the coarse and fine match, and eat more zinc-rich food, which can effectively prevent zinc deficiency.