Researchers Find Upper, Lower Body Gain Weight Differently

Article ID: 569158

Released: 1-Oct-2010 11:00 AM EDT

Source Newsroom: Mayo Clinic

Newswise — Using ice cream, candy bars and energy drinks to help volunteers gain weight, Mayo Clinic researchers have discovered the mechanisms of how body fat grows. Increased abdominal fat seems to heighten risk for metabolic disease, while fat expansion in the lower body -- as in the thighs -- seems to lower the risk. The findings, appearing in today’s Proceedings of the National Academy of Sciences (PNAS), help explain why.

“The cellular mechanisms are different,” explains Michael Jensen, M.D., Mayo Clinic endocrinologist and lead author of the study. “The accumulation of abdominal fat happens largely by individual cells expanding in size, while with fat gain in the femoral or lower body, it’s the number of fat cells that increases. So, different mechanism, different impact.”

Researchers recruited 28 volunteers to the research study. They were overfed for eight weeks, consuming giant candy bars, ice cream shakes, high-calorie drinks and almost anything else they wanted to eat. On average, participants put on 2.5 kilograms (kg) or 5.5 pounds (lbs) of upper body fat and 1.5 kg or 3.3 lbs of lower body fat. Even prior to fat gain, the preadipocytes (cells with the ability to become mature fat cells) in the upper body showed an increase in RNA messages which prompt proteins to synthesize fat.

Fifteen men and 13 women participated in the study. Researchers measured body fat and fat cell size before and after the eight weeks of overeating. Researchers say their findings challenge the concept that the number of fat cells in the body remains stable in adults. It also supports the idea that increased capacity to produce lower-body fat cells creates some form of protection to the upper body and potentially helps prevent metabolic disease which can lead to diabetes and other complications.

Others on the study include first author Yourka Tchoukalova, Ph.D.; Susanne Votruba, Ph.D.; Tamar Tchkonia, Ph.D.; Nino Giorgadze; and James Kirkland, M.D., Ph.D.; of Mayo Clinic. The research was funded by the National Institutes of Health, the U.S. Public Health Service, The Noaber Foundation and Mayo Clinic, including the Robert and Arlene Kogod Center on Aging.

About Mayo Clinic
For more than 100 years, millions of people from all walks of life have found answers at Mayo Clinic. These patients tell us they leave Mayo Clinic with peace of mind knowing they received care from the world’s leading experts. Mayo Clinic is the first and largest integrated, not-for-profit group practice in the world. At Mayo Clinic, a team of specialists is assembled to take the time to listen, understand and care for patients’ health issues and concerns. These teams draw from more than 3,700 physicians and scientists and 50,100 allied staff that work at Mayo Clinic’s campuses in Minnesota, Florida, and Arizona; and community-based providers in more than 70 locations in southern Minnesota, western Wisconsin and northeast Iowa. These locations treat more than half a million people each year. To best serve patients, Mayo Clinic works with many insurance companies, does not require a physician referral in most cases and is an in-network provider for millions of people. To obtain the latest news releases from Mayo Clinic, go to www.mayoclinic.org/news. For information about research and education, visit www.mayo.edu. MayoClinic.com (www.mayoclinic.com) is available as a resource for your general health information.


Comment/Share





Chat now!