[count-your-change]

I often do confuse cause and effect but I should get a pass on that since they sometimes wear disguises.

Just one more and I’ll be gone for a few days. Is there evidence that lack of Vit. D has been enough of a problem (bone density, etc.) in northern dwellers or early man that selection would (how shall I say it?)... ummm....be useful? Do we know that selection for lighter skin resulted from lower Vit D intake?

I have a bit of trouble framing the question, you see.

Until later and thanks.

[allmendream]

Yes. Rickets is a disease from lack of Vitamin D. Rickets is a very serious disease and inability to absorb enough sunlight in northern climates due to dark skin would be highly selected against as a result.

There is plenty of evidence of what happens when a dark skinned person moves to where they no longer get enough sunlight or vitamin D. They get rickets.

http://en.wikipedia.org/wiki/Rickets