Happened in under 12 months: Mercy Mwangangi opens up about sudden grey hair
By Valerian Khakayi, June 12, 2026Social Health Authority (SHA) CEO Dr Mercy Mwangangi has opened up about a surprising personal transformation, revealing that her hair turned grey within a very short period of time.
Speaking during an interview with Willow Health Media, she described the experience as the most shocking thing that has happened to her, saying she never expected such a rapid change in her appearance.
According to Mwangangi, her front hairline turned completely white in just under 12 months, a change she says happened gradually but noticeably over time
“The most surprising and shocking thing that has happened is that I now have white hair. The pretty girl is now a grey old woman,” Mwangangi said, reflecting on the transformation.
“In one year the frontline is all white completely, and it happened in just under 12 months.”
She added that she would notice the change daily as the process continued until her entire front hairline had turned white.
“Every day I would wake up and be like, ‘Another white hair,'” she added.
What causes white or grey hair?
White or grey hair is a natural part of ageing, but it can also happen earlier in life due to several factors.
The main cause is the reduction or loss of melanin, the pigment responsible for giving hair its colour. As people age, the cells that produce melanin (melanocytes) become less active or die off, leading to grey or white strands.
Genetics also play a major role. If parents or close relatives started greying early, there is a higher chance of experiencing the same.
Stress is another factor often linked to premature greying, although it is not always a direct cause. In some cases, long-term stress may affect overall hair health and speed up visible ageing signs.
Nutritional deficiencies can also contribute. Low levels of vitamins such as B12, iron, copper, and folic acid have been associated with early greying.
Certain medical conditions, including thyroid disorders and autoimmune diseases, may also lead to changes in hair pigmentation.
Lifestyle habits such as smoking have been linked to premature greying, as harmful chemicals can damage hair follicles.
While grey or white hair is often seen as a sign of ageing, it is generally a natural process and not always a sign of illness.