When Rachel Frederickson revealed her weight loss on The Biggest Loser finale, even Jillian Michaels was agasp. Until now, though, she hadn't opened up about it.
"I was stunned," the trainer told HuffPost Live.
"I thought she had lost too much weight."
Michaels said the show implements a number of checks and balances, including having the trainers check in with contestants even after the ranch.
But she had no idea Rachel Frederickson had been losing so much on her own, bringing her weight loss total to a staggering 155 pounds (out of 260).
"In my opinion, this had fallen through those checks and balances," she said of The Biggest Loser winner and her controversial season-ending reveal.
Frederickson herself has since said she may have gone to an extreme, admitting: "Maybe I was a little too enthusiastic in my training to get to the finale."
She also looked healthier this week on Today, but Jillian Michaels still expressed concern at the results, and that it wasn't just enthusiasm at work.
In fact, she likened her weight loss to the extreme weight gain that brought her to the NBC show in the first place, arguing that they're not too different.
"Anybody who gains too much weight or loses too much weight... these are both manifestations of the same issue," she said, making an interesting point.
"It simply means that somebody is utilizing their relationship with food to manage their emotions which are painful, hard, difficult to face or control."
Some critics have called for the show's cancelation in the wake of this result, but NBC hinted it will move forward with "small but significant" tweaks.
Watch the video above for more from Jillian, then scroll through the before-and-after images of Rachel below and tell us: Did she lose too much weight?
1. Rachel Frederickson Before and After Photos
Rachel Frederickson before and after weight loss on The Biggest Loser. What a transformation.
2. Rachel Frederickson Before and After
Rachel Frederickson before and after the huge weight loss that won her The Biggest Loser championship!
3. Rachel Frederickson Before Weight Loss
Rachel Frederickson before her amazing weight loss on The Biggest Loser. She weighed 260.
4. Rachel Frederickson After Weight Loss
Rachel Frederickson after her weight loss on The Biggest Loser. She lost 155 of her 260 pounds, now weighing in at 105.
5. Rachel Frederickson on The Biggest Loser
Rachel Frederickson working hard to lose weight on NBC's The Biggest Loser. Mission accomplished and then some.
6. Rachel Frederickson, Biggest Loser
Rachel Frederickson won The Biggest Loser with this incredible weight loss transformation. She's only 105 pounds now!
7. Rachel Frederickson, The Biggest Loser
Rachel Frederickson, The Biggest Loser winner, lost a ton of weight! Those stats speak for themselves!
8. Rachel Frederickson, Biggest Loser Competitor
Rachel Frederickson, The Biggest Loser competitor and later winner. What a transformation she achieved.
9. Rachel Frederickson, David Brown and Bobby Saleem
David Brown, Rachel Frederickson and Bobby Saleem of The Biggest Loser fame. Which one of them won it all?
10. The Biggest Loser Season 15 Finalists
The Biggest Loser Season 15 finalists are ready for their final weigh-in. Rachel ended up winning it all.
11. Rachel Frederickson in Disbelief
Rachel Frederickson can't believe her weight loss on The Biggest Loser. Nor can viewers.
Is Rachel Frederickson too skinny?