> Vitamin D, which helps bones absorb calcium, is activated by sunlight.

This is a misstatement.  Vitamin D does help bones absorb calcium.  What
sunlight does is help the body MAKE vitamin D from precursor molecules.  If
you have sufficient Vitamin D in your diet, you can live without sunlight at
all (see Inuit populations in the Arctic, for example).  Vitamin D in the
diet is not further affected by sunlight.

Kathy Dettwyler

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