It used to be that being called a loser was derogatory and hurtful. NBC has changed that, making it almost a badge of honor to be called a loser. And the Biggest Loser, that's the ticket. NBC's weight loss challenge show, The Biggest Loser, has turned Tuesday nights into must-see TV. Having just completed its fourth season, and the launch of the Biggest Loser Club, everyone wants in on the weight loss action.