The finale for The Biggest Loser aired on NBC last night to shocked judges and audience. One contestant revealed her new skinny self that many thought to be too skinny.

The show is meant to help people with unhealthy body weights develop a more healthy lifestyle and drop down to a healthier size. This year's winner, Rachel Frederickson, dropped a staggering 155 pounds accounting for 60% of her total starting weight.

Did Rachel become addicted to losing weight? Did the show and its premise encourage unhealthy weight loss? Even the trainers, Jillian Michaels and Bob Harper, couldn't hide their shock upon the reveal. And Twitter lit up with concerned tweets about the contestant's tiny self. See a before and after of Rachel's dramatic transition here.

Let me know what you think in the comments below.

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