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'Biggest Loser' Contestant's Shocking Weight Loss

Rachel Frederickson's drop from 260 lbs. to just 105 lbs. is stirring up controversy.
3:00 | 02/06/14

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Transcript for 'Biggest Loser' Contestant's Shocking Weight Loss
the uproar over the winner of "The biggest loser" who some are saying lost too much weight. Rachel Frederickson shocked fans when she revealed the body that went from 260 pounds all the way down to just 105 pounds. Juju Chang has the story for us. Your current weight is -- Reporter: It took just a matter of months to get to this moment. You lost 155 pounds. Reporter: After a tortuous journey of sweat and struggle 24-year-old Rachel Frederickson was declared the winner on NBC's "The biggest loser" finale Tuesday night. I won. Reporter: A $250,000 grand prize for a 155-pound weight loss. Congratulations. Reporter: That some are now saying went too far. The show's trainers seemed shocked. And on social media an outpouring of concern for her health. Some criticizing her for losing too much weight. This is a game show. It's not a healthy model for how you should be losing weight. What we recommend is one to two pounds per week, not the kind of enormous weight loss that she experienced. Reporter: Frederickson dropped 60% of her original body weight. The most in the show's history. Like all contestants she followed a program of rigorous diet and exercise. Constantly monitored by weight loss professionals. But some doctors question the program's safety when it leads to such extreme results. Having a prize of $250,000 to lose weight puts pressure on people to do things that might not be good for their health. Reporter: As for Frederickson now 5'4" and 105 pounds her bmi or body mass index is slightly below healthy. But despite the criticism t"the biggest loser" stands by their message stating "We remain committed to helping contestants achieve healthy weight loss and live healthier lifestyles and to inspiring viewers do the same." More than a few that looked shocked were the other team's trainers, Julian Michaels and bob -- they said "We're not comfortable commenting on Rachel's journey because we weren't her trainers and weren't given an opportunity to work with her at any point." Any questions about the contestants on "The biggest loser" should be directed to the show's producers. And Frederickson tells "Access Hollywood" she's never been more proud. It's not just a number, it's a life. I feel alive. Reporter: For "Good morning America," I'm juju Chang, ABC news, New York. Well, we asked you at home to weigh in and you did. You had a lot to say. Here's one example. One viewer tweeted "Watched the finale with my teenage daughters. Disturbing to reward emaciated young woman with cash prize. Dangerous message." But another viewer wrote, "She did look a little thin. It's her body though. Aas long as she's healthy and happy, it's all good. Great job, Rachel" so let's bring in a guy who knows more than a thing or two about weight loss. Our dear friend extreme weight loss transformationist, the special it and author of the book "Choose more, lose more," Chris Powell. Great to have you here with us. So, okay, this young woman set a record. This is the most in the history of this program, the percentage of body loss, what do you think about all it? Clearly what she did was impressive to lose that much weight. And she did what she set out to do. I mean that really is the name of the game to lose as much as you can in a short amount of time as you possibly can. Of course, in my opinion, though, the one thing that raises red flags is how fast she did it and how far she went. That does raise red flags but she's playing a game. We need to keep that in mind. That's the biggest thing. This is not necessarily real life. But she's playing a very real life game in the long rung. That's the catch-22 here. You've talked about this, as well. You have to change the way you think if you want to lose weight. Is it possible that she's taken this too far, that it's turned into kind of an unhealthy obsession of losing the weight. Absolutely and I'm glad you brought that up because it is, yes, it's about changing the way you think and most of the people that we work with, they come from the overeating side of things but we also need to remember that that is an eating disorder, an unhealthy relationship with food. It's so easy to switch over to the opposite end of the spectrum and maintain that unhealthy relationship with food by simply undereating. We deal with this a lot throughout our process, as well, working with people on the show and off the show. It's easy to overeat and it's easy to undereat, the true challenge is finding that balance. But then again throw a $250,000 cash prize in the mix and guess what, it's a slugfest to lose as much as you can. Yeah, very tricky stuff. All right, Chris, we thank you so much. Thank you. Good to see you, as always.

This transcript has been automatically generated and may not be 100% accurate.

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