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Some overweight adolescents may be at risk for weak bones
Date:3/4/2011

AUGUSTA, Ga. - Overweight adolescents already struggling with risk factors such as insulin resistance may need to add weak bones to their list of health concerns, researchers report.

A study of 143 overweight 14-18 year olds showed those with risk factors such as the precursor for diabetes and low levels of the blood-vessel protecting HDL cholesterol have less bone mass an indicator of bone strength than their overweight but otherwise healthy peers, according to researchers at Georgia Health Sciences University's Georgia Prevention Institute.

Other risk factors included high fat levels in the blood, higher blood pressure and a larger waist size, said Dr. Norman Pollock, GHSU bone biologist and corresponding author of the study published in The Journal of Pediatrics. In fact, total body fat didn't seem to impact bone mass: it was fat around the middle, or visceral fat, that seemed to increase the risk for bad bones just like it does the risk of diabetes and heart disease.

"The more risk factors you have, the less bone mass you have," Pollock said, noting that 62 percent of the overweight adolescents had at least one risk factor. It also indicates that the concept of "fit and fat" may apply to the bones.

Study participants without one or more of these risk factors tended to get slightly more vigorous physical activity although none of the participants got the recommended 60-plus minutes of daily physical activity, Pollock said. Interestingly daily caloric intake for all study participants was in the optimal range.

"This says to kids and their parents that restricting calories is not the answer; we need to focus more on increasing vigorous physical activity," Pollock said. Vigorous activity is defined as activity that increases the heart rate high enough to cause heavy breathing, such as jogging, tennis or jumping jacks. Studies have shown that physical activity prompts bones to release a hormone called o
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Contact: Toni Baker
tbaker@georgiahealth.edu
706-721-4421
Georgia Health Sciences University
Source:Eurekalert  

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