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Many Americans Fall Short on Their Vitamin D
Date:3/23/2009

Recommended levels in foods need to be increased, experts say,,,,

MONDAY, March 23 (HealthDay News) -- Over the course of two decades, vitamin D levels have dramatically decreased among Americans, a new study finds.

Low levels of vitamin D have been associated with rickets in children and lower bone mineral density in adults. Recent research has also linked insufficient vitamin D to cancer, heart disease, infection and poorer health overall. Optimal levels range from 30 nanograms per milliliter to 40 nanograms per milliliter, the researchers said.

"We found a marked increase in vitamin D deficiency over the past two decades," said lead researcher Dr. Adit Ginde, an assistant professor of surgery at the University of Colorado Denver School of Medicine. "Over three out of every four Americans now have vitamin D levels below what we believe is necessary for optimal health. African-Americans and Hispanics are at particularly high risk -- nearly all have suboptimal levels."

The report was published in the March 23 issue of the Archives of Internal Medicine.

For the study, Ginde's group collected data on vitamin D levels in 18,883 people collected between 1988 and 1994, and 13,369 people collected between 2001 and 2004. All the data came from the Third National Health and Nutrition Examination Survey.

The researchers found that average vitamin D levels were 30 nanograms per milliliter from 1988 to 1994, but decreased to 24 nanograms per milliliter between 2001 and 2004. Moreover, vitamin D levels of less than 10 nanograms per milliliter increased from 2 percent to 6 percent over the study period. There were also fewer people with vitamin D levels of 30 nanograms per milliliter or higher (45 percent vs. 23 percent).

The greatest drops in vitamin D levels were seen among blacks, where levels of vitamin D of less than 10 nanograms per milliliter rose from 9 percent to 29 percent, and le
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