eli5: If more melanin is advantageous in warm climates, why is less of it advantageous in colder climates? Wouldn’t darker skin still be most advantageous in cold climates where it might occasionally be hot?
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There’s another evolutionary aspect to this which seems to be missed so far in this thread. Imagine a dark skinned hunter, trying to catch prey in a predominantly white landscape! Would that work??? Of course not! Obviously the same applies the other way too.
Holy shit I’m reading this thread as a guy who gets frequent migraines. Was recently in Mexico, and thought I was so lucky and it was so great that I was not suffering from headaches. I think I have a vitamin D deficiency.
Holy shit I’m reading this thread as a guy who gets frequent migraines. Was recently in Mexico, and thought I was so lucky and it was so great that I was not suffering from headaches. I think I have a vitamin D deficiency.
Holy shit I’m reading this thread as a guy who gets frequent migraines. Was recently in Mexico, and thought I was so lucky and it was so great that I was not suffering from headaches. I think I have a vitamin D deficiency.
Before transport most people lived within a smaller distance of where they were born, meaning that the way their skin is adapted is based on survival in that environment as an average
An average of the whole years sunlight hours and intensity determines the base melanin concentration within cells (that gets passed on)
Then tanning (and it fading) takes up the peaks and troughs
Before transport most people lived within a smaller distance of where they were born, meaning that the way their skin is adapted is based on survival in that environment as an average
An average of the whole years sunlight hours and intensity determines the base melanin concentration within cells (that gets passed on)
Then tanning (and it fading) takes up the peaks and troughs
Before transport most people lived within a smaller distance of where they were born, meaning that the way their skin is adapted is based on survival in that environment as an average
An average of the whole years sunlight hours and intensity determines the base melanin concentration within cells (that gets passed on)
Then tanning (and it fading) takes up the peaks and troughs
Lighter skinned people make more vitamin D when hit by sunlight, darker skin people make less.
People who evolved in places with low levels of sunlight evolved lighter skin to absorb more D over the long winters. Farther north from the equator you go, lighter the skin of the natives, with a few exceptions.
Lighter skinned people make more vitamin D when hit by sunlight, darker skin people make less.
People who evolved in places with low levels of sunlight evolved lighter skin to absorb more D over the long winters. Farther north from the equator you go, lighter the skin of the natives, with a few exceptions.
Lighter skinned people make more vitamin D when hit by sunlight, darker skin people make less.
People who evolved in places with low levels of sunlight evolved lighter skin to absorb more D over the long winters. Farther north from the equator you go, lighter the skin of the natives, with a few exceptions.
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