Navigation Links
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 their bones than their leaner counterparts, leading most researchers to assume that being overweight is good for bone health.

When we corrected for the amount of muscle, we found that the obese person is not making as much bone as they should be for the amount of muscle that they have, Pollock said. People havent observed that in the past because they werent using the three-dimensional scan.

Lewis said the exact mechanisms by which excess fat hinders bone strength are unclear, but studies of obese rats show that they produce more fat cells in the bone marrow and fewer bone cells. Since fat and bone cells originate from the same precursor, it may be that fat cell production is favored over bone cell production in obese people.

The women the researchers studied were 18 and 19, an age at which the bones have stopped growing but before age-related degeneration begins. Lewis said future studies using three-dimensional bone imaging should follow children with normal and high levels of body fat through time to see how their skeletons grow. Other researchers have documented increased fractures in overweight children, suggesting that childhood obesity may be particularly detrimental to bone health.

When youre young you have the capacity to change the shape of your bones, but when you get older you dont have that capacity. Lewis said. And because of that, childhood obesity could have a significant, long lasting negative impact on the skeleton.


'/>"/>

Contact: Sam Fahmy
sfahmy@uga.edu
706-542-5361
University of Georgia
Source:Eurekalert

Related biology news :

1. Childhood obesity indicates greater risk of school absenteeism, Penn study reveals
2. A study by the MUHC and McGill University opens a new door to understanding cancer
3. Study begins to reveal clues to the cause and progression of sepsis
4. Clones on task serve greater good, evolutionary study shows
5. New study warns limited carbon market puts 20 percent of tropical forest at risk
6. New study examines how rearing environment can alter navigation
7. Study links cat disease to flame retardants in furniture and to pet food
8. New continent and species discovered in Atlantic study
9. Study shows link between alcohol consumption and hiv disease progression
10. Feeling hot, hot, hot: New study suggests ways to control fever-induced seizures
11. Study finds environmental tests help predict hospital-acquired Legionnaires disease risk
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/20/2016)... , May 20, 2016  VoiceIt is excited ... with VoicePass. By working together, VoiceIt ...  Because VoiceIt and VoicePass take slightly different approaches ... increases both security and usability. ... about this new partnership. "This marketing ...
(Date:5/3/2016)... May 3, 2016  Neurotechnology, a provider of ... MegaMatcher Automated Biometric Identification System (ABIS) , a ... projects. MegaMatcher ABIS can process multiple complex biometric ... combination of fingerprint, face or iris biometrics. It ... and MegaMatcher Accelerator , which have ...
(Date:4/26/2016)... 27, 2016 Research and ... Biometrics Market 2016-2020"  report to their offering.  , ... The analysts forecast the global multimodal biometrics ... during the period 2016-2020.  Multimodal biometrics ... such as the healthcare, BFSI, transportation, automotive, and ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... discussions on a range of subjects including policies, debt and ... Poloz. Speaking at a lecture to the Canadian ... to the country,s inflation target, which is set by both ... "In certain areas there needs to be ... why not sit down and address strategy together?" ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... ... is pleased to announce the launch of their brand, UP4™ Probiotics, into Target ... over 35 years, is proud to add Target to its list of well-respected ...
(Date:6/23/2016)... ... 23, 2016 , ... Charm Sciences, Inc. is pleased to ... AOAC Research Institute approval 061601. , “This is another AOAC-RI approval of the ... Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods perform comparably ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the sample tracking software company, ... Crime Laboratory, has joined STACS DNA as a Field Application Specialist. , “I ... President and COO of STACS DNA. “In further expanding our capacity as a scientific ...
Breaking Biology Technology: