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Sat, 7 Oct 2000 12:37:13 +0100 |
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On Fri, 06 Oct 2000, Cave Chick wrote:
> 3 oz of canned salmon only contains around 300 milligrams of calcium -- so a
> whole 7 ounce can would only be half of the recommended 1,200mg per day women
> are supposed to get. I'm wondering if this recommended amount is just a lot
> of hoohey. Thoughts? Also, one would have to eat completely unrealistic
> amounts of greens to make up the deficit.
The recommended amount may be misleading, as a person's calcium status
appears
to be more related to the ratio between absorption and excretion.
Some factors affecting absorption :-
1/.The ratio between calcium and magnesium in the diet.
2/.The amount of vitamin D available.
3/.The amount of phytic acid and other mineral binding compounds in
the diet.
Some factors affecting excretion :-
1/.The pH balance produced by the metabolism of the diet. A diet which
produces
an acidic residue is often buffered using calcium.
2/.The amount of exercise taken.
There are many more factors involved, the above, incomplete, selection
being
taken from :- "Textbook of Pharmacology" by Bowman/Rand.
We know that HG's don't use dairy products, and I agree that eating
several
kilo's of greens each day would seem to be unlikely. It may be that a
HG, who
spends a lot of time in the sun, does a lot of exercise, eats no grain
products, and has a diet which produces a neutral acid residue, can
get by on a
much lower intake of calcium. It would appear that many other factors
have to
be considered apart from total daily intake.
Andy.
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