> The answer seems to be that dietary grains interfere with calcium
> absorption, and mineral absorption in general, because the phytic
> acid in the grains binds with the mineral ions.  Thus, a
> grain-rich diet creates a need for more dietary calcium, to
> compensate for what the phytic acid is stealing.

If this is true, how come women in cultures (in the far east) whose diet
primarily consists of grains (rice) do not exhibit anywhere near the
symptoms of calcium deficiency (e.g. osteoporeisis) found in United
States?