By Dr. Bryan Rithesh Miranda
Hair turning grey is a natural part of ageing, but what causes this transformation? In this article, we will break down the scientific process behind why hair loses its colour and what you can expect as you get older.
What Determines Hair Colour?
Your natural hair colour is determined by a pigment called melanin. Melanin is produced by special cells known as melanocytes found in hair follicles. There are two types of melanin:
Eumelanin: Gives hair darker shades like black and brown.
Pheomelanin: Responsible for lighter shades such as blonde and red.
The blend of these two pigments determines the exact color of your hair. Melanocytes are highly active when you're young, continuously producing melanin as your hair grows.
Why Does Hair Turn Grey?
As we age, melanocytes start to slow down and eventually stop producing melanin altogether. Without melanin, the new hair growing from the follicles appears grey, silver, or white.
This process is influenced by a combination of genetic factors, environmental triggers, and biological ageing.
1. Genetics: Family history plays a huge role in when and how quickly you go grey. Some people notice greying in their 20s, while others might not until their 40s or later.
2. Oxidative Stress: Over time, the body accumulates oxidative stress, which can damage melanocytes and contribute to early greying.
3. Ageing: Ageing naturally reduces the production of melanin. With age, the melanocyte function slows down, leading to a gradual loss of colour.
Does stress cause hair to turn grey?
There is a widespread belief that stress can turn your hair grey. While stress does contribute to premature greying, it is not the sole cause. Chronic stress affects various biological processes, potentially accelerating the decline of melanocyte function. However, genetics remains the primary determinant.
How Common Is Grey Hair?
Grey hair is extremely common, especially among older adults. By the age of 50, about 50% of people have some degree of grey hair. The speed and intensity of greying can vary widely depending on individual factors, including ethnicity and overall health.
Can You Prevent Greying?
Greying is a natural part of life and is largely influenced by genetics. While certain factors like diet and stress management may delay the process, there is no guaranteed way to prevent it entirely. Embracing grey hair is increasingly common, with many people opting to let it show as part of their personal identity.
For those who prefer to cover their grey hair, there are cosmetic options such as hair dyes, toners, and highlights.
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