According to the natural selection concept, lighter skin colour is developed to maximize vitamin D synthesis.
What is the connection between skin colour and vitamin D?
Compared to skin that is less pigmented, skin pigmentation, or melanin, absorbs the UVR that starts vitamin D synthesis, lowering the amount of vitamin D produced for a given exposure.
Why does lighter skin produce more vitamin D?
UV rays can be absorbed more effectively by lighter skin. This aids the body's ability to manufacture more vitamin D for functions like calcium development. People with a fair complexion who live in areas with lots of sunlight and close to the equator are more likely to experience folate deficiency.
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