Re: Vitamin D from animal foods vs. the sun

[Guest guest]

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> I get enough of sun but was just wondering if dietary vitamin D would

> have any unique benefits that the sun doesn't offer.

This is pure speculation, but I wonder whether dietary D would be more

effective at stimulating the expression of proteins on the intestinal

lining which are involved in mineral absorption. Maybe knows

more, but I'm not aware of any work comparing the effects of the two

sources.

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[Guest guest]

,

> This is pure speculation, but I wonder whether dietary D would be more

> effective at stimulating the expression of proteins on the intestinal

> lining which are involved in mineral absorption. Maybe knows

> more, but I'm not aware of any work comparing the effects of the two

> sources.

I doubt it, because this is regulated by calcitriol, which gets

activated from vitamin D in the kidneys. Granted, there is some

calcitriol in food, and there is probably some activation that occurs

in the intestine, but this is probably much tinier than the amount

made by the kidney, which is a homestatic response to maintain blood

calcium levels.

Chris

[Guest guest]

Chris-

> Granted, there is some

> calcitriol in food, and there is probably some activation that occurs

> in the intestine, but this is probably much tinier than the amount

> made by the kidney, which is a homestatic response to maintain blood

> calcium levels.

OK, strike out that hypothesis. <g>

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