Gray hair is not the more you pull out the more, gray hair is mainly related to tyrosinase activity reduction, mental stress, nutritional disorders, and so on. 1. Reduced tyrosinase activity: tyrosinase has a great relationship with the formation of gray hair, if the tyrosinase activity is reduced, it will cause a decrease in melanin synthesis, thus causing gray hair. 2. Mental stress: Mental stress will cause the body to synthesize and transport melanin function is blocked, resulting in gray hair, life should ensure adequate sleep, appropriate exercise, relaxation. 3. Nutritional disorders: Because of malnutrition, nutritional disorders or chronic diseases, the lack of copper or iron in the body will lead to excessive gray hair. In daily life, you can eat more liver, eggs, black beans, etc., to improve the condition of gray hair. Gray hair is not the more you pull out more, but it is not recommended to pull out hair frequently, if you are not feeling well in time to seek medical advice, consult a physician for guidance.