The reason why hair turns from black to white is that the function of pigment cells in hair generally declines. When it can't produce pigment particles at all, hair turns white. Normal people began to decline at the age of 35.

The common causes are: blood-heat impairing yin, deficiency of liver and kidney, and deficiency of qi and blood can all lead to white hair. The nutrition of hair comes from blood, blood heat generates wind, burns yin essence, and leads to the loss of nutrition of hair. Normal people may grow some white hair at any age, which is just one of the reasons. If it is not particularly long, or it is gradually increasing, it is normal.

In addition, clinically, such as endocrine diseases, pituitary lesions, immune disorders, vitiligo, chronic wasting diseases, albinism, malnutrition, etc., white hair may appear. In diet, trace elements, vitamins and tyrosine are closely related to the color of hair.

Ingestion of foods containing iron and copper such as liver, fungus, kelp, sesame seeds and nuts. ; Eat more cereals, beans, vegetables and other foods rich in B vitamins. Eat more foods rich in tyrosine, such as meat and fish. It can be seen that the diet is still reasonable and diversified, so don't blindly pursue black food.

: introduction to white hair:

1. White hair refers to all or part of white hair. White hair is caused by the decrease of melanin particles in the medulla and cortex of hair or air filling. There are two reasons: congenital and acquired.

2. Under normal circumstances, there are abundant blood vessels in dermal papilla, which provide sufficient nutrition for dermal papilla and hair bulb, and melanin particles are successfully synthesized. When the formation of melanin particles in papilla and hair bulb is hindered, or melanin particles in medulla and cortex of hair cannot be transported to hair due to some factors, white hair will appear.

3. White hair refers to all or part of white hair, which can be divided into congenital and acquired. Congenital white hair often has a family history, and localized white hair is more common, especially before hair. Acquired white hair includes senile white hair and juvenile white hair. Some are old and weak, with a little white hair. Adolescent white hair is common in children and adolescents, and often has a family history. Except for the increase of white hair, it does not affect health. Young people suddenly have white hair, which is related to malnutrition.

Generally speaking, there are several reasons for the day after tomorrow: lack of nutrition, long-term mental stress and lack of sunshine. Traditional Chinese medicine believes that gray hair is caused by kidney yin deficiency, and weak renal function leads to slow down the metabolic function of the body. Therefore, to treat white hair, we must first tonify kidney and yin, and fundamentally regulate it. In addition, some skin diseases such as vitiligo can also lead to white hair. Normal people usually start to have white hair at the age of 35. If it appears early, you'd better go to treatment. White hair caused by congenital inheritance is difficult to treat, but white hair caused by acquired causes can be improved after treatment.

If a person is depressed, in a bad mood or highly nervous for a long time, staying up late for a long time and overworking will make his hair turn from black to white. For example, during the Spring and Autumn Period and the Warring States Period in China, Wu Zixu, a doctor of the State of Wu, suddenly became white-haired overnight in order to muddle through Zhaoguan. Du Fu's poem: I stroke my white hair. It has become so thin that it can no longer hold hairpins. The French writer Hugo described the fierce and painful ideological struggle of the mayor of Hou Delin in his Les Miserables.

When he decided to admit that he was a prisoner in court, "after only one hour, his gray hair turned white". Both historical legends and literary descriptions are exaggerated, but after all, it shows that people have long thought about it and found that the change of hair from black to white is related to mental factors.

7. Hair is an appendage of the skin, and it needs adequate nutrition just like other organs and tissues in the body. Different races have different hair colors. White people have blond hair, and brown people have red and black hair.

8. Yellow people are brown and black because the pigment particles in their hair contain copper, cobalt and iron. If they lack inorganic salts such as copper, cobalt and iron in their diet for a long time, it will naturally affect the synthesis of melanin and make their hair turn from black to white. In addition, according to medical clinical observation, if the body lacks protein, vegetable oil, vitamin B 1, vitamin B2 and vitamin B6 for a long time, it will also lead to the hair turning from black to white.

Reference: Baidu Encyclopedia White Hair