The purpose of this study is to look at certain areas of the brain that are related to
addictive behaviors, such as overeating. These areas are called 'dopamine type 2 receptors'
(DRD2/3) and other studies have shown that obese people have less of these. We propose that
low DRD2/3 availability seen in morbidly obese subjects will change with weight loss
associated with bariatric surgery.