Children with gray hair may lack the following elements: 1. Lack of trace elements, hair pigment particles contain a mixture of copper and iron, when the diet lacks copper, cobalt, iron and other elements, it will lead to gray hair. Lack of protein and a high degree of malnutrition is one of the causes of early gray hair, in order to prevent early gray hair, the diet should be rich in iron, copper and other trace elements of food intake, such as animal liver, eggs, soybeans, sesame, nuts, etc. 2, lack of vitamin B, lack of vitamin B1, vitamin B2, vitamin B6, is also an important cause of gray hair, parents are advised to give their children a proper diet of more foods rich in vitamin B, such as cereals, milk, animal liver, green leafy vegetables, etc.