It is impossible for human beings to grow old overnight. When a person grows gray hair, it can indicate that the person may be old. There are also some young people who may have some bad symptoms because of their own health, or because they are under too much pressure from work and study. White hair will grow. There is even a saying in the society called overnight graying. For example, if you suddenly encounter a big blow, you may make your hair turn gray a lot overnight.
The reason for the graying of the hair is because there is a pigment called melanin in the hair. The melanin is divided into black and brown. They can directly determine the color of their hair, but they cannot be determined by the human body. Control, some people's hair will appear when melanin is produced, so that some other factors in the body will also change, which is why the hair turns gray, or some people's hair may be turn yellow.
The American Medical Association once conducted an experiment, and the process of the experiment is not much to say, but the final results show that the main factors of hair graying are age and stress, and there is not much relationship. Of course, in addition to their own stress factors and age factors, there is also a genetic factor. It seems that a researcher at a university in the United States discovered a gene in the body that can prevent the production of melanin when conducting research on human genes. Once sufficient melanin cannot be produced, it will cause changes in one's own hair. For example, it will turn red, or it will turn brown.
One Night Whitehead
No matter what the cause is, everyone's hair turns gray. It is all caused by long-term physical changes, so it is impossible to have the so-called overnight graying. If the mental pressure is high and the age reaches a certain ageAfter setting the limit, it is quite normal to find that you have two extra white hairs on your head.