The reason why some people think that they are getting more and more grey hairs is due to the decrease of melanin in the body, and after pulling out a grey hair, what grows out of that follicle afterwards will still be white. At the same time, the hair that grows out of other hair follicles will also appear white, so at a glance it appears that there are more grey hairs and there is an illusion. It is not recommended to pull out grey hairs indiscriminately because pulling out hairs may damage the hair roots.

　　Hair grows out of the hair follicle, and the colour of the hair is determined by the melanin secreted by the hair mother cells in the follicle. When the melanin particles are large in number and high in density, the hair is black, and vice versa, it is light in colour.

　　There are many reasons that affect the secretion of melanin, for example, the melanin produced by melanocytes will gradually decrease after the age of 40, and genetic factors, poor nutrition, mental stress, lack of sleep, and poor digestion will also affect the secretion of melanin.

　　For people with less white heads, one category is congenital, with family genetic history. The other category is acquired, caused by poor nutrition and lack of protein and vitamins.

　　In addition, excessive use of the brain, too much anxiety can also make the child premature grey hair. This kind of grey hair is "reversible", when the child can ensure adequate sleep, reduce stress, appropriate supplementation of vitamins and trace elements, and supplemented with scalp massage, the number of these grey hairs will gradually reduce and disappear.

　　It is recommended that white hair should be analysed from their own, according to their own situation to adjust, and it is recommended to consume more black beans, sesame seeds, walnuts, mulberries, wolfberries and other foods on weekdays, can slow down the growth of white hair.

　　Middle-aged people can consume more jujube, red bean, yam, etc.; and the elderly, liver and kidney deficiency is more, can consume more mulberry, wolfberry and other kidney food.

　　Specifically to each person, the situation is different, according to the doctor's guidance to identify and treat.

　　What can I eat to prevent my hair from turning grey?

　　Middle-aged and elderly people can often eat purple rice, black beans, red beans, green beans, red diamonds, black sesame seeds, walnuts and other staples, but also eat more chicken, beef and lamb, pork liver, turtle, dark meat fish, sea cucumbers and other meat. In addition, middle-aged and elderly people should also eat carrots, spinach, purple radish head, purple cabbage, shiitake mushrooms, black fungus and so on.

　　1, chestnut

　　Some people have not yet entered the middle age on the number of white hair, which in addition to genetic causes, and hair lack of nutrients have an important relationship. Shepherd's purse is rich in protein, carotene, crude fibre, vitamins, iron, calcium, phosphorus and other nutrients, can play a role in preventing the effect of early hair grey after eating.

　　2, black sesame

　　Hair dry, easy to be torn, split ends, white and other conditions, can be improved by eating black sesame. Black sesame contains a lot of oleic acid, folic acid, protein, palmitic acid, vitamin E and calcium and many other nutrients needed for hair care.

　　3, monkey head mushroom

　　Monkey head mushroom is one of the best in hair care and beauty, and eating it regularly helps to promote hair growth. Monkey head mushrooms are high in protein and provide a rich source of vitamins and minerals for hair care.

　　4. Carp

　　Carp is a relatively easy to buy fish, eat carp can make the hair become dark and shiny, to prevent hair yellowing.