Subway riders walk through the turnstiles while leaving the U.S. Open in New York September 4, 2007. A new program developed by the U.S. government is tackling the obesity epidemic by helping 'tween' girls and their parents make small but important changes to build a healthier lifestyle. (Lucas Jackson/Reuters)Reuters - A new program developed by the U.S. government is tackling the obesity epidemic by helping "tween" girls and their parents make small but important changes to build a healthier lifestyle.