LeBrok
Elite member
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- Calgary
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- Y-DNA haplogroup
- R1b Z2109
- mtDNA haplogroup
- H1c
vitamin d theory of light skin adaptaion to low uv to produce more vitamin d is debunked long ago
firstly light eyes and skin repel sunlight not attract it so pale skin does not produce any vitamin d
http://en.wikipedia.org/wiki/Vitamin_D#cite_ref-Holick_2006_1-0Vitamin D[SUB]3[/SUB] (cholecalciferol) is produced through the action of ultraviolet irradiation (UV) on its precursor 7-dehydrocholesterol. Human skin makes vitamin D[SUB]3[/SUB] and supplies about 90% of vitamin D.[1]
Vitamin D[SUB]3[/SUB] is produced photochemically in the skin from 7-dehydrocholesterol. The precursor of vitamin D[SUB]3[/SUB], 7-dehydrocholesterol is produced in relatively large quantities, 10,000 to 20,000 IU of vitamin D are produced in 30 minutes of whole-body exposure, in the skin of most vertebrate animals, including humans.[109] 7-Dehydrocholesterol reacts with UVB light at wavelengths between 270 and 300 nm, with peak synthesis occurring between 295 and 297 nm.[110] These wavelengths are present in sunlight, as well as in the light emitted by the UV lamps in tanning beds (which produce ultraviolet primarily in the UVA spectrum, but typically produce 4% to 10% of the total UV emissions as UVB). Vitamin D[SUB]3[/SUB] can be made in the skin. Exposure to light through windows is insufficient because glass almost completely blocks UVB light
At the bottom of this wiki page you will find 162 titles of scientific papers confirming this. 162 papers!
so again adaptation theory is debunked by real science, no light skin does not produce vitamin d light skinned people have usually much lower levels of vitamin d
Please produce one scientific paper saying that skin of white people doesn't produce vitamin D3!
They sit in school half a day, spend time in front of computers at home and mother religiously apply sunscreen these days.if light skin would produce more vitamin d these white children would not get a deficiency of vitamin d on a vegan(fishless, dairyless diet)!!! http://www.dailymail.co.uk/health/article-1028854/How-strict-vegan-diet-children-ill.html