Jillian Michaels has admitted The Biggest Loser's fifteenth-season winner Rachel Frederickson became too skinny and she's worried.

Since issuing a general statement earlier this month that was void of any personal opinion, Michaels has finally revealed how she really feels about Frederickson dramatically dropping from 260 to 105 pounds on her slim 5'5" frame.

"I was furious on a bunch of different levels because I felt like, how did we not know? How did the show fail her? It's obvious we believe she's too thin. It's absurd on many levels, for her and how this happened, and I'm concerned about why we weren't told," The Biggest Loser trainer told The Tennessean newspaper on Tuesday.

"It's a competitive reality show. It's very clear this went way too far. I think there are a lot of answers that everyone including myself are waiting on. I have a meeting with the show's producers to discuss my concerns."

Michaels was caught mouthing "oh my God" to fellow trainer Bob Harper on-camera during The Biggest Loser's live fifteenth-season finale when Frederickson, 24, revealed her transformation for the first time onstage. She lost 155 pounds total, which was nearly 60 percent of her body weight and won her the show's $250,000 grand prize.

Harper had said earlier this month he was "stunned" by Frederickson's drastic weight-loss. Likewise, trainer Dolvett Quince -- who worked closely with Frederickson during her The Biggest Loser experience -- suggested at the time his client's "journey to good health has not yet ended."

Frederickson had a BMI of only 17.5, which is considered underweight for her height, according to the National Institute of Health. But Frederickson repeatedly dodged questions on whether she felt she became "too skinny" or "took things too far" for weeks.

The Biggest Loser champion, however, appeared on Wednesday's episode of NBC's Today show looking much healthier, and she defended herself once again, insisting she had an "absolutely healthy weight-loss" via diet and exercise over the course of seven months.

"There's good and bad in everything," Michaels told The Tennessean. "What the show has done for millions of people who watched it, for the many, many contestants who've participated, for myself and for the many other people involved has been tremendous."