AE READINGS

AE READINGS - AE READINGS Skin Deep - Human skin color has...

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AE READINGS Skin Deep - Human skin color has evolved to be dark enough to prevent sunlight from destroying the nutrient folate but light enough to foster the production of vitamin D Hirsute to Hairless - Earliest humans presumably lost hair first, then skin color changed. - Increase in sweat glands on surface of body reduced body hair. - Then problem of protecting skin from damaging effects of sunlight (UV) Built-in Sunscreen - Melanin is nature’s sunscreen. - High concentration of melanin arose in the skin of peoples in tropical areas because it protected them against skin cancer. The Folate Connection - Dark skin evolved to protect the body’s folate stores from destruction. Human Skin on the Move - UVB rays are harmful, however they initiate the formation of vitamin D in the skin. - Dark skinned people living in the tropics generally receive sufficient UV radiation. - Outside tropics, this is not the case. o
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AE READINGS - AE READINGS Skin Deep - Human skin color has...

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