I thought this article was fortuitous:)
Annie
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Control your destiny or somebody else will.~Jack Welsh
Vitamin D and Calcium Interplay Explored
ARS News Service
Agricultural Research Service, USDA
March 12, 2010
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___________________________________________
Increasing calcium intake is a common--yet not
always successful--strategy for reducing bone
fractures. But a study supported in part by the
Agricultural Research Service (ARS) underscores
the importance of vitamin D and its ability to
help the body utilize calcium. The study also may
explain why increasing calcium alone isn’t always
successful in dealing with this problem.
Currently, calcium intake recommendations are not
tied to vitamin D status, which may explain why
markedly different recommended calcium intakes
exist among countries. In the United States, the
recommended calcium intake is 1,200 milligrams
(mg) daily for adults aged 50 and older.
The body's skeleton needs adequate dietary calcium
to reach its full potential in terms of bone mass.
Still, many other factors affect bone mass, such
as exercise, smoking and vitamin D--the latter
through its effect on calcium absorption and
direct effect on the skeleton.
The study involved a close look at about 10,000
men and women aged 20 and older participating in a
nationally representative survey. Coauthors
included nutrition specialist Bess Dawson Hughes
with the Jean Mayer USDA Human Nutrition Research
Center on Aging (HNRCA) at Tufts University in
Boston, Mass. Dawson Hughes is director of the
HNRCA Bone Laboratory.
Blood levels of 25-hydroxyvitamin D are used as
the primary indicator of vitamin D adequacy.
Within the study sample of U.S. adults, a large
fraction of younger and older adults were below a
suggested desirable serum vitamin D concentration
of at least 75 nanomoles-per-liter (nmol/L).
The study supports the idea that correcting
inadequate blood levels of vitamin D is more
important than increasing dietary calcium intake
beyond 566 mg a day among women and 626 mg a day
among men for better bone mineral density. For
example, a higher calcium intake beyond 566 mg a
day may only be important among women whose
vitamin D concentrations are low (less than 50
nmol/L), according to authors.
Details of this study can be found in the
publication Journal of Bone and Mineral Research.
ARS is the U.S. Department of Agriculture’s (USDA)
principal intramural scientific research agency.
The research supports the USDA priority of
improving nutrition and health.
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