Uriah

Icelanders don’t have problem drinking rates higher than other Europeans, but this is confounded by the fact that they enforced prohibition until NINETEEN EIGHTY-NINE. I don’t think they were just being sticklers: there is something funny going on here.

But circling back to the main point: In Coon’s The Races of Europe I believe the Irish are the only group singled out for the thickness of their bones and part of the mechanism has probably been a ruthless selection for both light skin and high baseline levels of Vitamin D.

D helps protect Irishmen against rickets and inflammatory diseases, but an expected benefit of the selection was this it provided them with a stronger immunity to schizophrenia than any other North European people. Psychotism is a plus if your body can handle it and they could.

About ¼ of Mormons have Scandinavian surnames, principally Danish and Norwegian, and I think the low hanging cluster of dots on the bottom of CEU represents individuals of majority Scandinavian descent that I know to exist in the dataset.

Scandinavians are under strong selective pressure to keep schizophrenia low, but their high consumption of fish both reduces the power of that pressure and redirects it away from acting directly upon schiz causing alleles and instead improving omega-3 metabolism instead.