http://goo.gl/YOa5Thus, before agriculture, Europeans got substantial vitamin D from their diet only in coastal regions, like Scandinavia, where people ate fatty fish. Europeans who lived inland—the majority—did not have this dietary source. One might counter that the issue is not vitamin-D content per se but rather substances, like phytic acids in cereals, that deplete the body’s supply of calcium and phosphorus. The advent of agriculture would have artificially increased the body's need for vitamin D.
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