Friday, January 31, 2014

Vitamin D and Calcium Absorption

Vitamin D

Have you heard? Vitamin D enhances calcium absorption. That's why our milk, rich in the latter, is fortified with the former.

But what is probably less known is that the vitamin D in a cup of milk is not aiding the absorption of the calcium in the same cup.

I'm not exactly certain on the timelines involved, but rhetorically speaking, at least, it's the vitamin D in yesterday's milk that helps us absorb the calcium in today's.

It's because vitamin D in the diet must be modified in the liver and then in the kidney before it's biologically active.

And, yes, vitamin D is a fat-soluble vitamin, so there really is no good reason to drink vitamin D-fortified skim milk.

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