That isn't true. The population demelanated because UV radiation is required for the production of vit. D in the skin. Extreme northern climates do not get enough light to penetrate heavily melanated skin which results in low levels of vit D which depresses the immune system and has a negative impact on bone development. It has nothing to do with metabolic resources. The "only" means of avoiding this selection pressure, naturally, is to have a diet heavy in fish which has high levels of vit. D.
On a side note, African-Americans are generally found to have a need for vit D supplements due to living in a northern climate and wearing a lot of clothes. If you live in northern climates and have dark skin (and don't drink vit D enriched milk) you should be taking a supplement, particularly in the winter and should make a point to get out into the sun, particularly in the winter months.
- Syracuse UniversityPublic Relations/African American Studies, 1985 - 1989
- Temple UniversityAfrican American Studies, 1989 - 1992
- Zodiac LoungeCEO, 2005 - present
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