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Higher but not lower doses of vitamin D are effective in fracture risk reduction in older adults
Date:7/5/2012

BOSTON (July 5, 2012) Based on the results of a pooled analysis of 11 unrelated randomized clinical trials investigating vitamin D supplementation and fracture risk in more than 31,000 older adults, Bess Dawson-Hughes, MD, director of the Bone Metabolism Laboratory at the Jean Mayer USDA Human Nutrition Research Center on Aging (USDA HNRCA) at Tufts University, says higher doses of Vitamin D may be the most beneficial in reducing bone fractures in this age group.

As part of the study, published today in The New England Journal of Medicine, Dawson-Hughes and colleagues divided the subjects into quartiles ranging from 0 to 2,000 International Units (IUs) of daily vitamin D intake. The top quartile sustained 30% fewer hip fractures and 14% fewer fractures of other bones compared to the control groups.

"Taking between 800 IUs and 2,000 IUs of vitamin D per day significantly reduced the risk of most fractures, including hip, wrist and forearm in both men and women age 65 and older," said Dawson-Hughes, the study's senior author. "Importantly, we saw there was no benefit to taking Vitamin D supplements in doses below 800 IUs per day for fracture prevention."

Dawson-Hughes and colleagues analyzed each participant's vitamin D supplementation within and independent of the study protocol, controlling for age, vitamin D blood levels at baseline, additional calcium supplementation and whether the person lived independently or under medical care.

"Evaluation of individual-level data is the gold-standard of meta-analysis," said lead author Heike Bischoff-Ferrari, MD, D.Ph., director of the Centre on Aging and Mobility at the University of Zurich and Waid City Hospital and a visiting scientist in the Bone Metabolism Laboratory at the USDA HNRCA. "Our results make a compelling contribution to the existing data on Vitamin D and fracture risk in men and women age 65 and older, whose vulnerability to bone density loss and osteoporosis
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Contact: Andrea Grossman
617-636-3728
Tufts University, Health Sciences Campus
Source:Eurekalert

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