Did Tuberculosis Kill Our Ancestors?

The article is actually pointing out that the migration of dark-skinned people out of tropical areas to more temperate regions caused them to have lower levels of Vitamin D. Since UV light is blocked by the skin pigment melanin and it's a known process that UV light stimulates Vitamin D synthesis within the body from cholesterol, then decreased UV light absorption results in decreased endogenous Vitamin D production. The theory is that the decreased Vitamin D compromised their immune systems and made them more susceptible to TB infection.
 
Breath said:
The article is actually pointing out that the migration of dark-skinned people out of tropical areas to more temperate regions caused them to have lower levels of Vitamin D. Since UV light is blocked by the skin pigment melanin and it's a known process that UV light stimulates Vitamin D synthesis within the body from cholesterol, then decreased UV light absorption results in decreased endogenous Vitamin D production. The theory is that the decreased Vitamin D compromised their immune systems and made them more susceptible to TB infection.
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Aren't you a little Miss Smarty Pants:ninja
 
Breath said:
The article is actually pointing out that the migration of dark-skinned people out of tropical areas to more temperate regions caused them to have lower levels of Vitamin D. Since UV light is blocked by the skin pigment melanin and it's a known process that UV light stimulates Vitamin D synthesis within the body from cholesterol, then decreased UV light absorption results in decreased endogenous Vitamin D production. The theory is that the decreased Vitamin D compromised their immune systems and made them more susceptible to TB infection.
Click to expand...

thats what evolutions all about......these people moved from africa and ended up in europe......hence white europeans
 
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