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Effective Obesity Treatment Likely To Require Targeting Of Multiple Weight,,Control Systems

Investigators reviewing three decades of research into body weight regulation conclude that it may not be possible to find a single effective treatment for obesity. Instead, drug therapy may have to target the multiple systems that control weight.

Drs. Stephen Woods and Randy J. Seeley, formerly of the University of Washington and now of the University of Cincinnati Medical Center, and Drs. Daniel Porte, Jr. and Michael W. Schwartz of the University of Washington School of Medicine review obesity research dating back to 1966 in the May 29 issue of the journal Science.

The authors focus on the molecular signals that control food intake. The research review shows that the body has numerous integrated and redundant systems for regulating weight, and that many pathways in the central nervous system participate in responding to signals informing the brain about the fat content of the body.

"While the notion of a single 'magic bullet' for obesity treatment is overly optimistic," said Schwartz, "there is good news. Namely, progress into understanding of the weight control system will likely lead to drug combinations that are effective in treating obesity. We can be encouraged that treatments will improve, but we must be realistic that multiple systems must be targeted for long-term weight control to be effective. No single intervention is likely to do the trick."

The authors cite the example of the difficulty of achieving weight loss by reducing calorie intake. When calories are cut, insulin and leptin levels decrease, and hormones secreted by the adrenal cortex (glucocoricoid or GC hormones) increase -- a combination that activates nerve pathways that stimulate appetite and promote weight gain, while at the same time inhibiting pathways that have the opposite effect. These dual responses maximize the body's tendency to find a physiological balance (homeostasis), and consequently maximize the efficiency of the body i
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Contact: Laurie McHale
lmchale@u.washington.edu
(206) 543-3620
University of Washington
28-May-1998


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