> >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 *********************************************** The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(TM) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html