Last week, the Centers for Disease Control and Prevention reported that in 2009, no state had met a target of reducing obesity prevalence among adults to 15 percent. Why is obesity so prevalent in America? And what can we do to combat the problem? University at Buffalo researcher Teresa Quattrin, MD, who is leading a more than $2.5 million study to test an innovative program for preventing and treating obesity in children aged 2 to 5, offers her expert opinion.