& D against Cancer
Kamen, PhD, and Dr. Michael Rosenbaum, MD
Copyright © 2002 by Nutrition Encounter, all rights reserved
and vitamin D supplementation can achieve at least a 20 percent
reduction in colon cancer deaths and osteoporosis-related fractures.
The average intakes
of calcium and vitamin D in the US adult population are far below
adequate values recommended. These deficiencies elevate the risk
of osteoporosis and colon cancer.
It is suggested that
we should increase calcium intake by about 400 milligrams, and
vitamin D intake by about 200 IU – daily!
After age 10, intake
of calcium is below recommendations for both men and women, and
after age 50, it is only slightly over half the recommended amount
for most people in the US.
Older, less active
people are more prone to vitamin D inadequacy. Sunlight exposure,
the best source of vitamin D, is essentially lacking in the winter
in northern US. Summer stores of vitamin D are often inadequate
by the end of winter.
One of the major contributors
to osteoporosis is low dietary calcium. Adding to the problem
is the fact that bone-forming cell activity decreases after age
60 in both men and women.
studies indicate a role for increased calcium to reduce colon
cancer risk. [These facts are explored in detail in my book, Lose
Weight with the California Calcium Countdown.]
Even a modest increase
in calcium intake may confer protection against colon cancer among
those with low intakes.
function of vitamin D is to maintain calcium concentrations within
the normal range by enhancing its efficiency from the diet.
Source: American Journal
of Clinical Nutrition 2004;80(2)264-270; Lose Weight with the
California Calcium Countdown, Betty Kamen, 2004.
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