Introduction: The "war on obesity" is now well into its second decade.' What began as an effort to encourage medical doctors to screen and treat patients whose weight put them at risk for health problems has transformed into a much broader public health campaign to address the root causes of obesity. A growing number of state, territorial and local health departments are currently exploring new ways to promote healthy eating and physical activity. At the federal level, the U.S. Centers for Disease Control and Prevention (CDC) has made "nutrition, physical activity and obesity" a top priority.