New research is shedding surprising light on the most effective way to prevent obesity among American teenagers.  Instead of the "calories in/calories out" approach that has long been favored for weight loss, an Archives of Pediatric and Adolescent Medicine study published June 6 said that the Dietary Approach to Stop Hypertension (DASH) diet may be more effective at preventing the gradual weight gain that leads to obesity.

Obesity affects around 18 percent of American teenagers, according to a US News magazine report released in March.  Click here to learn more about the data around childhood obesity, and how to assess your child's risk.

What are your thoughts on childhood obesity?