>It is known that white skin in hot sun and coloured skin in less hot sun do not
make as much vit. D as needed.

Please provide a reference for the first part of this sentence.  I have
never seen anything to suggest that light skinned people near the Equator do
not make as much Vitamin D as needed.

This does not make sense, logically.  And it is the intensity of the Ultra
Violet radiation that matters, not the "heat" of the sun, which is why you
find darker skinned populations living near the Equator and lighter skinned
populations the farther you go north or south of the Equator.

Kathy Dettwyler

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