Zinc is an essential trace element that is involved in almost all metabolic processes in the human body. Zinc deficiency can cause clinical manifestations such as taste disorders, growth retardation, decreased immunity and abnormal neuropsychological development. The symptoms of zinc deficiency are different for different groups of people: 1. Taste disorder: zinc is mainly involved in the process of taste regulation, and children with zinc deficiency often show symptoms of loss of appetite, picky eating, indigestion, and omnivorous eating such as eating paper and dirt; 2. Zinc is also an important component of the metabolism of the endocrine system and the central nervous system. Long-term zinc deficiency in children can seriously affect growth and development, with common symptoms including malnutrition, short stature, wasting, thinning and yellowing hair, white spots and barbs on the nails, and mental retardation. Pregnant women: During pregnancy, the demand for zinc increases. Inadequate zinc supplementation may aggravate nausea, vomiting and other pregnancy reactions, and may even affect the growth and development of the fetus in the body in case of severe zinc deficiency. Adults: Zinc deficiency in some adults can affect the body’s metabolism of vitamin A, which can lead to vision loss and even night blindness. It can also cause reproductive disorders, such as low sperm, low sperm motility and low female libido. Therefore, it is recommended that the general adult population should also have a balanced diet to avoid zinc deficiency caused by picky eating. Fourth, the elderly: the elderly body functions gradually degenerate, at this time most of the zinc deficiency will have memory loss, attention loss, and lower immune function and other symptoms. For daily zinc supplementation, you can eat lean meat, pork liver, walnuts and other foods. For severe zinc deficiency, you can take zinc supplements under the guidance of a doctor, but also pay attention to avoid over-supplementation of zinc, which can also cause abnormalities.