AURORA, Colo., Mar 24, 2009 (UPI via COMTEX) -- Although low vitamin D is
linked to cancer, heart disease and infection, the average U.S. blood levels of
the "sunshine" vitamin decreased, researchers said.
Dr. Adit A. Ginde of the University of Colorado Denver School of Medicine in
Aurora, said that evidence suggests that levels of 30 nanograms per milliliter
to 40 nanograms per milliliter may be needed for optimum health.
Ginde and colleagues compared levels of serum 25-hydroxyvitamin D -- a measure
of the amount of vitamin D in the blood -- from the Third National Health and
Nutrition Examination Survey, collected between 1988 and 1994, to those
collected during NHANES 2001-2004. Complete data were available for 18,883
participants in the first survey and 13,369 participants in the second survey.
"Overall, the mean serum 25-hydroxyvitamin D level in the U.S. population was 30
nanograms per milliliter during the 1988-1994 collection and decreased to 24
nanograms per milliliter during the 2001-2004 collection," the study authors
said in a statement.
The study, published in the Archives of Internal Medicine, found the prevalence
of levels lower than 10 nanograms per milliliter increased from 2 percent to 6
percent between the two study periods.
Racial and ethnic differences persisted throughout the surveys; among
non-Hispanic blacks, the prevalence of 25-hydroxyvitamin D levels of less than
10 nanograms per milliliter increased from 9 percent to 29 percent and levels of
more than 30 nanograms per milliliter or higher decreased from 12 percent to 3
percent.
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