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Biggest Loser winner: How thin is too thin?

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OKLAHOMA CITY - While millions of Americans waited to see what the contestants look like now on Tuesday night's finale of 'The Biggest Loser,' viewers took to social media to ask whether one participant went a little too far with her weight loss.

Rachel Frederickson won the title of 'The Biggest Loser' during Tuesday night's finale, earning her a $250,000 grand prize.

However, viewers began criticizing how much weight she lost when it was revealed the competitive swimmer dropped down to 105 pounds.

Frederickson came to the 'Biggest Loser Ranch' weighing 260 pounds.rachel before

Throughout the competition, she fought through every challenge and ended the last episode weighing 150 pounds, earning her spot in the final three.

She finished the show weighing just 105 pounds, meaning she lost 59.6 percent of her body weight.

According to the Centers for Disease Control, her BMI puts her in the underweight category.

Now, many fans are calling on the show to make a statement about healthy weight loss, following last night's finale.