Biggest Loser Winner's Massive Weight Loss Sparks Health Concerns

Rachel Frederickson | Photo Credits: Trae Patton/NBC

After months of workouts and dieting, Rachel Frederickson was crowned the winner of The Biggest Loser Season 15. But her bone-thin appearance on the live finale Tuesday night sparked some concern over her health.

A former competitive swimmer, Frederickson began the competition at 260 pounds. When she weighed in Tuesday, she was down to 105.

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