Overweight Elderly May Lack Vitamin D
Posted on: Friday, 8 June 2007, 09:00 CDT
Overweight elderly adults have low levels of vitamin D in their blood, but researchers are not sure why, according to a U.S. study.
Corresponding study author Susan Harris, an epidemiologist at the Bone Metabolism Laboratory at the Jean Mayer U.S. Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, has found that lack of sun exposure may not account for low levels of vitamin D in the elderly and overweight.
Harris and co-author Dr. Bess Dawson-Hughes interviewed 381 Caucasian men and women ages 65 and over about their sun exposure over a previous three-month period.
When adjusted for sex, age, seasonality and dietary vitamin D intake, 25-hydroxyvitamin D -- the storage form of vitamin D -- significantly decreased as body fat increased. After the researchers adjusted for sunlight exposure variables, 25-hydroxyvitamin D values still significantly decreased as body fat increased, according to the study published in the Journal of Clinical Endocrinology & Metabolism.
The most likely explanation seems to be that vitamin D is sequestered in fat tissue, reducing its entry into the blood, Harris said in a statement.
Source: United Press International
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