AURORA, Colo. (May 14, 2012) - Why does one person become anorexic and another obese? A study recently published by a University of Colorado School of Medicine researcher shows that reward circuits in the brain are sensitized in anorexic women and desensitized in obese women. The findings also suggest that eating behavior is related to brain dopamine pathways involved in addictions.
Guido Frank, MD, assistant professor director of the Developmental Brain Research Program at the CU School of Medicine and his colleagues used functional magnetic resonance imaging (fMRI) to examine brain activity in 63 women who were either anorexic or obese. Scientists compared them to women considered "normal" weight. The participants were visually conditioned to associate certain shapes with either a sweet or a non-sweet solution and then received the taste solutions expectedly or unexpectedly. This task has been associated with brain dopamine function in the past.
The authors found that during these fMRI sessions, an unexpected sweet-tasting solution resulted in increased neural activation of reward systems in the anorexic patients and diminished activation in obese individuals. In rodents, food restriction and weight loss have been associated with greater dopamine-related reward responses in the brain.
"It is clear that in humans the brain's reward system helps to regulate food intake" said Frank. "The specific role of these networks in eating disorders such as anorexia nervosa and, conversely, obesity, remains unclear."
Scientists agree that more research is needed in this area. The study was published in Neuropsychopharmacology.
Faculty at the University of Colorado's School of Medicine work to advance science and improve care. These faculty members include physicians, educators and scientists at University of Colorado Hospital, Children's Hospital of Colorado, Denver Health, National Jewish Health, and the Denver Veterans Affairs Medical Center. Degrees offered by the University of Colorado School of Medicine include doctor of medicine, doctor of physical therapy, and masters of physician assistant studies. The School is located on the University of Colorado's Anschutz Medical Campus, one of four campuses in the University of Colorado system. For additional news and information, please visit the University's newsroom online.