Source: U.S. Government Accountability Office This GAO report (1) describes the key strategies identified by experts as most important to include in programs to prevent or reduce childhood obesity; (2) provides examples of how selected programs implemented the key strategies identified and challenges these programs faced; (3) describes the program elements identified by experts as most important to include in programs to prevent or reduce childhood obesity; and (4) provides examples of how selected programs implemented key elements identified and the challenges these programs faced.