Question 2: why do human hair turns white when we age? @Lovelystar

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Human hair turns white as we age primarily due to the gradual decrease in melanin production. Melanin is the pigment responsible for the color of hair, skin, and eyes. Here's a more detailed explanation of the process:Melanin Production:Hair color is determined by the presence of two types of melanin: eumelanin (brown and black pigments) and pheomelanin (yellow and red pigments). The combination and concentration of these pigments result in the wide range of hair colors.Aging and Melanin:As people age, melanocytes (the cells that produce melanin) in hair follicles gradually reduce their activity. This leads to a decrease in melanin production, causing hair to lose its color and turn gray or white.Genetics:Genetic factors play a significant role in determining when and how quickly hair turns gray or white. Some people may experience graying in their 20s, while others may not see significant changes until later in life.Oxidative Stress:Over time, oxidative stress can damage melanocytes. This stress is caused by the accumulation of reactive oxygen species (ROS) in the body, which can damage cells and reduce their ability to produce melanin.Health and Lifestyle Factors:Certain health conditions, nutritional deficiencies, and lifestyle factors (such as smoking) can accelerate the graying process. However, the primary cause remains the natural aging process and genetics.In summary, the turning of hair to white with age is mainly due to the decline in melanin production by melanocytes, influenced by genetic and environmental factors.