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FILE - This Jan. 6, 2012 file photo shows fitness guru Jillian Michaels in New York. "The Biggest Loser" will return in January with the weight-loss show's first young teen participants and trainer Jillian Michaels back on duty. NBC says the show's 14th season will take on a new "mission" against the national increase in childhood obesity. Young people between the ages of 13 and 17 will join teams trying to shed pounds and get fit. (AP Photo/Carlo Allegri, file)

FILE - This Jan. 6, 2012 file photo shows fitness guru Jillian Michaels in New York. "The Biggest Loser" will return in January with the weight-loss show's first young teen participants and trainer Jillian Michaels back on duty. NBC says the show's 14th season will take on a new "mission" against the national increase in childhood obesity. Young people between the ages of 13 and 17 will join teams trying to shed pounds and get fit. (AP Photo/Carlo Allegri, file)