Why do people have white hair? Find out the scientific answer
Why do people have white hair? Much has been said in research reports in this regard. It is not uncommon for hair to turn gray with age. Hair is any color when young, but begins to turn white with age because over time the functions of the cells that maintain the color in the hair follicles are affected.
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Gray hair may be considered a sign of aging, but it can occur at any age.
By the way, scientists have not yet fully understood the mechanism of this natural process, but in recent years there have been some research reports in this regard, from which it is known to some extent that the hair of people in youth or middle age. Why do they turn white?
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In 2018, a University of Alabama study reported that graying hair may be the result of activation of the innate immune system.
According to research published in the journal PLOS Biology, overstimulation of the immune system has negative effects on melanocytes, the cells that maintain hair color.
A study has shown that there is a link between exposure to a viral infection and graying of hair.
Experiments on mice discovered that when a virus attacks the immune system, infected cells produce interferons in response, sending signals to surrounding cells to protect themselves.
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According to research, although these signals are beneficial to health, due to their high number, the number of melanocyte cells begins to decrease and the hair coloring process stops.
The researchers said it is hard to say whether the results of this mouse study can be applied to humans, but it provides a possible explanation for why some people turn gray at a young age.
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In a 2020 study published in the journal Nature, experiments on mice showed that exposure to stress reduces the number of melanocytes, the cells that maintain hair color.
These are the cells that live in the hair roots.
During this study, rats were injected with compounds that increased levels of stress hormones.
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Researchers have found that increasing stress increases the amount of a chemical called norepinephrine in hair follicles.
The scientists said that the chemical affects the cells in the hair follicles that promote the growth of new hair and gradually the cells stop producing new pigment, after which the hair color begins to turn white.
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Although the results of this study cannot be fully applied to humans because it involved mice, a study published in 2021 in the journal Elfie directly observed the effects of stress on human hair.
Research has found that stress can cause premature graying of hair in humans, but this change is not permanent.
This study provides the first evidence to suggest a link between stress and gray hair.
The study involved 14 people and asked them to write about their life experiences and stress.
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Researchers have found that stressful events such as losing a job can cause hair to turn gray, but it is possible to reverse the process by managing the stress.
Scientists have developed a mathematical model that could explain how stress causes hair graying by predicting stress-related changes in mitochondria and DNA.
Remember that mitochondria are like antennae inside cells that respond to various signals, including stress.
According to the researchers, our model suggests that gray hair needs to reach a certain threshold, which is approached in middle age due to various factors, while stress accelerates the journey to it.
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Simply put, graying hair due to stress in youth and improving mental condition very early, it is possible to reverse hair color.
But scientists have pointed out that the process of turning white hair color back to black is very rare.
In April 2023, a study from the Grossman School of Medicine in New York claimed to have discovered the mechanism of hair graying.
In fact, scientists claimed that after this discovery, it may be possible to prevent people's hair from turning white or to reverse the white color.
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The research, published in the journal Nature, focused on melanocytes, the cells that maintain hair color.
At the beginning of life, these cells are very active, but due to the process of aging, shedding, and regrowth, these cells gradually become stuck in the roots of the hair, making them unable to do their job.
In this study, these cells were evaluated in mice.
It is this potential process that leads to loss of deep hair color and graying, the researchers said.
The discovery of this mechanism could potentially reverse hair graying by correcting the position of the cells, the researchers said.
He said these experiments on mice were successful, and perhaps the method can work in humans.
Research has found that during normal hair growth, cells migrate to different cells in the hair roots and activate cells in them that maintain hair color.
Research has found that this entire process depends on where these stem cells are located.
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