If it is a case of hair turning red: 1, genetic factors: the color of hair is related to genes, if most of the family is red hair, it should be considered a normal physiological manifestation, no special treatment is needed. If this situation is not caused by new factors, but suddenly become red. 2, pathological performance: mainly due to the lack of some nutrients in the body caused, such as protein intake is insufficient, can appear hair red, so usually in the diet to pay attention to eat more meat, beans, milk and other protein-rich food, the body lack of iodine can also appear red hair and performance withered, need to usually in the You need to pay attention to eat more iodine-rich foods such as kelp in your diet.