> >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.

I do not have a reference to this, it was teached to me years ago and I'm
searching the crinkles in my brains to remember if I made notes and if so where
to find them. I'll share it when I find it..

>
> 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.

Yes you're right, it is the intensity, not the heat. But I do remember from the
lecture (mentioned above) that it had to do with the differences in pigment
quality or quantity (I'm not sure, but I think the latter) in different
skin-types that are responsible for the ability to deal with a certain intensity
of Ultra Violet radiation in relation to the vit. D synthesis. But your remarks
do make we wonder if I've been wrong all this time or misunderstood the lecture
or that the lecturer had it wrong.
>
> Kathy Dettwyler

Gonneke van Veldhuizen

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