Just a thought, most people at northern latitudes (Scandinavia, Russia) who have low Vitamin D production traditionally ate a lot of dairy, whereas people at southern latitudes with high Vit D production generally eat little dairy and likely get far less overall calcium.
The main function of Vitamin D is to increase intestinal calcium absorption, Vit D and Calcium interact so that lower intake of one can be compensated by higher intake of the other, but it also means that having a high intake of both could spell real trouble - namely hypercalcemia. I'm thinking that if you are of northern descent, and especially if you consume a lot of dairy, your need for Vit D will be far lower than someone of southern descent who eats little dairy. Also because of genetic polymorphisms in Vit D metabolism that make northerners use Vit D more efficiently and make southerners more wasteful of Vit D.
Ray Peat encourages high consumption of both dairy and Vit D supplementation, and I'm wondering if this might not lead some people to develop problems with hypercalcemia.
The main function of Vitamin D is to increase intestinal calcium absorption, Vit D and Calcium interact so that lower intake of one can be compensated by higher intake of the other, but it also means that having a high intake of both could spell real trouble - namely hypercalcemia. I'm thinking that if you are of northern descent, and especially if you consume a lot of dairy, your need for Vit D will be far lower than someone of southern descent who eats little dairy. Also because of genetic polymorphisms in Vit D metabolism that make northerners use Vit D more efficiently and make southerners more wasteful of Vit D.
Ray Peat encourages high consumption of both dairy and Vit D supplementation, and I'm wondering if this might not lead some people to develop problems with hypercalcemia.
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