Your ability to recite studies seems impressive but Colin Cambell's
research has even found its way into mainstream nutrition texts now. (I've
been talking about this for years and it is only recently that this has
been studied more). I am not talking about amino acid studies. The most
impressive studies are epidemiological studies comparing many cultures and
controlling for external and possible internal influences. Those cultures
with the highest ANIMAL protein suffer the most from osteoporosis-despite
their high calcium intakes. Those eating high or low plant proteins and low
calcium intakes have not suffered any osteoporosis. I'll have to look into
your sources because I have heard nothing of the sort-increasing meat for
increased calcium absorption? Additionally, Calcium balance has always been
known to adjust itself fairly well. You statement that a low calcium intake
decreases absorption goes against basic nutrition principles.-Cherie

> Cherie Moore wrote:
>
> >I totally agree that a high protein (specifically animal
> >protein) has been associated with a negative calcium balance and we
should
> >be looking at decreasing our protein more than increasing calcium.

> Don wrote:
> You should be aware that the studies that correlated calcium loss with
high
> protein diets used isolated, fractionated animo acids from milk or
eggs.(1)
> Dr. Herta Spencer, of the VA Hospital in Hines, IL shows that when
protein
> is given as meat, subjects do not show any increase in calcium excreted,
or
> any significant change in serum calcium, even over a long period.(2)
Other
> investigators found that a high protein intake increased calcium
absorption
> when dietary calcium was adequate or high, but not when calcium intake
was
> a low 500 mg per day.(3)
>
> (1) Herta Spencer and Lois Kramer, "Factors contributing to
osteoporosis",
> Journal of Nutrition, 1986 116:316-319
>
> (2) Herta Spencer and Lois Kramer, "Further studies of the effect of a
high
> protein diet as meat on calcium metabolism", American Journal of Clinical
> Nutrition, June 1983 37 (6):924-929
>
> (3) HM Linkswiler, et al, "Calcium retention of young adult males as
> affected by level of protein and of calcium intake", Trans. N.Y. Acad.
Sci.
> 1974 36:333