In article <3857B74A.802 at erols.com>, Stuart Dunn <dunns99 at erols.com> wrote:
> > BTW, If excess calcium is appearing in the urine then that is a marked
> > sign of a kidney disorder. ~10mg of calcium is removed by glomuelar
> > filtration BUT ~9.82mg is readsorbed in the proxiamal and distal tubules.
> > Thus about 175mg is all that will appear in the urine on any given day.
> And if only a tenth of the calcium eaten is absorbed, this works out to
> be 1750 a day that must be eaten. Either you have to megadose on calcium
> or use an easily absorbed form.
Roughly speaking, you should eat about 1 g of calcium a day. 500 mg will
be adsorbed into the calcium pool in the body. Your body will secrete
about 325 mg into the gut. This means that the net absorption from diet
is about 175 mg/day. If you megadose on calcium, then the numbers
relating to adsorption will not change but the numbers relating to
excretion will. What your body does not need, it discards.
Peter
