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Study suggests link between obesity, poor bone health
Date:11/26/2007

Athens, Ga. Being overweight is a known risk factor for heart disease, diabetes and a host of other health conditions. Now, a University of Georgia study published in the November issue of the American Journal of Clinical Nutrition finds that obesity may also be bad for bone health.

Researchers conducted advanced three-dimensional bone scans on 115 women ages 18 and 19 with normal (less than 32 percent) and high (greater than 32 percent) body fat. After adjusting for differences in muscle mass surrounding the bone, the researchers found that the bones of participants with high body fat were 8 to 9 percent weaker than those of normal body fat participants.

Obesity is an epidemic in this country, and I think this study is critical because it highlights another potential negative health effect that people havent considered, said study co-author Richard D. Lewis, professor of foods and nutrition at the UGA College of Family and Consumer Sciences.

Previous studies on bone health and obesity used a two-dimensional bone densitometer that is commonly used in osteoporosis screenings. Lewis explained that a notable shortcoming of the bone densitometer is that it does not take into account bone shape and geometry, which have a substantial influence on bone strength. The new study used a three-dimensional imaging technique that measures both the amount of mineral in the bone and its shape and geometry. The study found that, surprisingly, normal- and high body-fat young adult females have comparable bone strength in a direct comparison that does not account for muscle mass.

The fact that the two groups had similar bone strength measures is remarkable in itself, because you would expect it to be higher in the heavier person, Lewis said.

Doctoral candidate Norman Pollock, lead author of the study, explained that muscle exerts force on bones, which stimulates bone growth. Overweight people tend to have more muscle surrounding th
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Contact: Sam Fahmy
sfahmy@uga.edu
706-542-5361
University of Georgia
Source:Eurekalert

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