Biggest Loser's Rachel Frederickson criticized over weight loss

Tuesday night's finale of rapid weight-loss show The Biggest Loser drew sharp criticism online after the winner clocked in at a seemingly unhealthy 105 pounds for her five-foot-four frame.

Rachel Frederickson lost 155 pounds during her time on The Biggest Loser

Rachel Frederickson won the latest season of The Biggest Loser after losing nearly 60 per cent of her body weight. (Trae Patton/NBC/The Associated Press)