NBC’s The Biggest Loser is a little lighter today. Alison Sweeney, who has been a host on the weight-loss competition show since 2007, has exited the program. No reason was given and no replacement was named for the veteran series, which debuted in 2004 and has been renewed for a 17th cycle. “After an incredible run together, Alison Sweeney will not be returning as host of The Biggest Loser next season,” the show’s producers said in a statement.