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MSU researchers discover potential genetic factor in eating disorders
Date:6/4/2010

EAST LANSING, Mich. For the first time, scientists have discovered a possible biological culprit in the development of eating disorders during puberty: a type of estrogen called estradiol.

The groundbreaking pilot study led by Michigan State University found that influence of one's genes on eating disorder symptoms was much greater in pubertal girls with higher levels of estradiol than pubertal girls with lower levels of estradiol. The study appears in the journal Psychological Medicine.

Lead investigator Kelly Klump, MSU associate professor of psychology, said previous research had established that eating disorders are influenced by both genetic and environmental factors once a girl hits puberty.

The underlying effects of the genes, however, were unknown.

"The reason we see an increase in genetic influences during puberty is that the genes for disordered eating are essentially getting switched on during that time," said Klump. "This research was trying to figure out why. What's turning on the genes during puberty? And what we found is that increases in estradiol apparently are activating genetic risk for eating disorders."

Estradiol is the predominant form of estrogen in females and is responsible for the growth of reproductive organs and also influences other organs including bones.

Klump noted that researchers don't yet know which genes are being switched on by estradiol. Further, she said a larger study is needed to confirm the results of the MSU-led research.

But knowing that estradiol likely plays a role in the development of eating disorders could ultimately open the window to new treatments, said Klump, past president of the Academy of Eating Disorders.

In addition, she said, prevention efforts could be geared toward those girls who not only are in high-risk environmental contexts (such as weight-focused sports), but also those with genetic risks such as a family history
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Contact: Andy Henion
henion@msu.edu
517-355-3294
Michigan State University
Source:Eurekalert  

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