"The Biggest Loser" winner Rachel Frederickson is breaking her silence on her shocking weight loss.

The 24-year-old reality TV star surprised everyone when she showed off her unbelievable 155 pound weight loss during the show's finale -- and talk quickly turned to her too-thin frame.

Frederickson went from 260 to 105 lbs. during her time on and after the show and many were concerned with her health, saying she actually lost too much weight.

A week later, Rachel is finally speaking out about the controversy.

"Maybe I was a little too enthusiastic in my training to get to the finale," Frederickson admits to PEOPLE. She also revealed she maintained a 1,600-calorie daily diet in the three months between when the show finished taping and the live finale -- while working out 6 hours a day. 6 hours!

When asked if she thinks she has an eating disorder, she replied, "I am very, very healthy."

Of course, those watching from home weren't the only ones surprised by her appearance. Even her trainer says he was "shocked" at what he saw.

"The first thing that went through my mind was, 'That's just too much,'" Dolvett Quince admits.

That being said, the show's executive producer Dave Broome says she "passed all the required medical tests ensuring she was healthy."

Now that she's no longer trying to win a reality show, hopefully she eases back on those 6-hour workouts.

Immediately following her win, Rachel appeared on "Today," where even she said she wasn't sure if she'd maintain the weight she's at now, but plans to "try new exercises and just continue on this path and see where it takes me."

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