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?
Is Rachel Frederickson too skinny?