Just a random thought, does it have any uses, how does it happen and why?
In: Biology
This reminds me of a Tom Segura bit.
(Talking about his Doctor)
“Then he tested my vision. He washed his hands, he tested my vision. [audience laughs] And he goes, “You’re right. You have latent farsightedness.” I go, “What does that mean?” This is his quote. “Your vision’s always sucked. You just didn’t know it.” [audience laughs] I go, “Do you care to explain more?” He goes, “Think of it like this. Your eyes have been fighting to make you think you can see well. And now they’re tired. [audience laughs] That’s why you’re here.” I go, “Dude, that’s like me saying, ‘I’m young, uh, and my skin got tired. Now I’m old.’” [audience laughs] He goes, “That’s an interesting way of putting it.” I go, “No, it isn’t. [audience laughs] I’m just old and blind.” “Don’t forget you’re balding.” And I go, “I know. [audience laughs] I used to have hair, but they got tired, then they fell out.” And he goes, “Now, you’re getting it.” I’m like, “Dude. [audience laughs] How do you get paid to do this?””
Basically, Your hair gets tired of making all that color.
As we age the level of Methionine sulphoxide reductases or MSRs in our hair drops, which increases the level of hydrogen peroxide in the hair. Tyrosinase an enzyme which governs melanin in the hair is disrupted by the low levels of MSR and high levels of hydrogen peroxide resulting in grey hair. However the MSRs also can combat oxidative stress which plays a role in cell damage and aging. https://youtu.be/YtmwzSbLaQk
Remember that hair is coloured by melanin. Brown hair is eumelanin and red hair pheomelanin. Same stuff thats in your skin and eyes. When you age your hair stops being able to produce this protective melanin. So grey hair is also more likely damaged by UV rays from the sun.
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