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A study examined the effect of sunlight on folate — a vitamin B complex — levels. Hairless skin, however, is particularly vulnerable to be damaged by ultraviolet light and this proved to be a problem for humans living in areas of intense UV radiation, and the evolutionary result was the development of dark-coloured skin as a protection. The solution was sweating and loss of body hair. Photodegration occurs when melanin absorbs photons. UV rays can strip away folate, which is important to the development of healthy foetuses. Eastern odyssey24—26 doi: This page was last edited on 3 Aprilat

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These humans could search for food and hunt for longer periods before being forced back to the shades.

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More recent research has found that human populations over the past 50, years have changed from dark-skinned to light-skinned and vice versa. The American Journal of Cardiology. This is not a problem near the equator; however, it can be a problem at higher latitudes. As a consequence of vitamin D deficiency, they are at a higher risk of developing ricketsand numerous types of cancers, and possibly cardiovascular disease and low immune system activity. The New York Times. University of California Press. Proceedings of the National Academy of Sciences.

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