"Normal circumstances"? Why is our milk fortified with Vitamin D if most people produce enough? -- Janet Davis
Vitamin D is synthetized by human body, but in quantities that might be not sufficent. Level of synthesis depends on sun activity, so in winter and in polar areas it's more like a vitamin, and in summer and in equatorial areas it's less like a vitamin.
That's what I thought. I believe it also depends on how dark your skin is. So why does the fact that some people sometimes produce enough make it "not a true vitamin"? (I'm trying to understand this, rather than just striking it from Vitamin, since I don't consider myself an expert.) -- Janet Davis
Except that it is more probable that most people always make enough vitamin D. It requires only 45 minutes a week sun exposure with otherwise proper nutrition. Those few who live in polar climes in winter and those unfortunates that don't get out enough may need supplementing. It seems it is added to milk at least partly because vitamin D's job is promoting calcium adsorbtion in the intestines. I beleive vitamin D is the only vitamin naturally produced in the body.? --rmhermen
BNF: Vitamin X ::= 'Vitamin' <Letter> | 'Vitamin' <Letter><Number>
-- Taw
:-) I still think it's confusing. Not everyone knows about formal grammars. I'll try to think of a better way to say it. -- Janet Davis
Your changes look good, Taw. -- Janet Davis
You're completely right. Will fix that. --Taw