As a marketing executive involved with the 50 Million Pound Challenge, a national weight-loss initiative, Pam El has spent the past few years traveling the country to help Americans who are struggling with obesity. Until a year and a half ago, El was one of the very same people she was trying to help. In fact, during her first year touring the country for the challenge, she gained 20 pounds. Her life changed when she saw herself -- at 5-foot-2 and 217 pounds -- on a promotional video.