That's why you gray your hair.

Now, for the first time, Harvard University scientists have discovered exactly how the process develops: stress activates nerves that are part of the war response that cause permanent damage to stem cells that regenerate pigment in hair glands. Stress affects the body and is a step ahead of scientists toward blocking its negative effects.

Because stress affects the whole body, researchers first had to find out which system of the body was responsible for linking stress to gray hair. Researchers first found that stress causes an immune attack on pigment - producing cells. However, when rats with a lack of cells infernal cells cracked the hair, they then turned to the cortisol hormone.

Stress always raised the hormone levels cortisol in the body, so researchers thought that cortisol can have a role. But surprisingly, when they removed the overstressed gland from rats so that they would not produce hormones similar to cortisol, their hairs again turned gray when they were subjected to stress.

Their Lasting Harm

In the hair cell, certain stem cells act as the reserve of pigment cells. When the hair regenerates, some stem cells become pigment - producing cells that dye the hair. When we started to study this, they expected stress to be bad for the body, but the harmful stress impact they discovered was beyond what was imagined,” highlighted “Hsu” After just a few days, all stem cells that regenerate the pigment were lost. After they disappeared, they could no longer regenerate the pigment. The damage is permanent.