1. Mental factors

If a person has been depressed for a long time, in a bad mood or highly stressed, or overworked, his hair can turn from black to white. For example, during the Spring and Autumn Period and the Warring States Period in our country, Wu Zixu, a doctor of the Wu State, turned his hair all gray overnight in order to get through Zhaoguan; the French writer Hugo described in his "Les Misérables" the mayor of Udlan who went through a fierce battle. , painful ideological struggle, determined to go to court to admit that he was a prisoner, "his gray hair turned white in just an hour." Whether it is historical legends or literary descriptions, although they are all a bit exaggerated, they show that people have long believed that the change of hair from black to white is related to spiritual factors.

2. Poor nutritional status

Hair is an appendage of the skin. Like the organs and tissues in other parts of the body, it needs adequate nutrition. Different races have different hair colors. The hair color of Caucasian people is golden, and the hair color of brown people is red-black. The hair color of us yellow people is brown-black because the pigment particles in our hair contain copper, cobalt, and iron. If there is a long-term lack of copper in the diet, Inorganic salts such as cobalt and iron will naturally affect the synthesis of melanin and turn hair from black to white. In addition, according to medical clinical observation, if the body is lacking protein, vegetable oil, vitamin B1, vitamin B2, and vitamin B6 for a long time, it will also cause the hair to turn from black to white.

3. Diseases, drugs and genetics

Diseases, drugs and genetics are also factors that cause hair to turn from black to white, decreased pituitary gland function, endocrine disorders such as hyperthyroidism, tuberculosis, typhoid, Consuming diseases such as pernicious anemia and autonomic nervous system dysfunction are all diseases that have been found to be related to the change of hair from black to white.

4. Overuse of the brain

Research has found that mental workers are under high pressure for a long time, are highly stressed, and have no time to take care of physical exercise. In addition, they have unbalanced diet and bad living habits. etc., thus prone to premature gray hair.