He studies the brain and behavior as they relate to obesity. He was not involved in the new research, but says it’s an important study. It points to how complex the eating experience is, he says. However, one study is not enough to link portion size to specific areas of the brain, he adds. It’s possible that other things, such as a food’s color, could have affected brain responses. “There’s work to be done before drawing any firm conclusions,” he says.