The latest winner of NBC's "The Biggest Loser" is sparking debate about her dramatic weight loss.

Twenty four year old Rachel Frederickson shed almost 60 percent of her body weight, revealing a rail think frame that even drew a reaction of shock from the show's trainers Bob Harper and Jillian Michaels on the show's live season finale Tuesday night. Viewers quickly took to Twitter to comment on Frederickson's new physique, some pointing out that the Los Angeles-based voiceover artist is now underweight for a woman of her age and size. Others wished her well and called her an inspiration.

Frederickson shed 155 pounds, dropping from 260 pounds to 105 pounds over the course of the reality competition. She told NBC's "Today" show after the finale that she's not sure she'll maintain her current weight but plans to try new exercises and continue on the path to see where it will take her. In addition to the title of "Biggest Loser," Rachel also walked away with $250,000 for her efforts.

[Metro Networks]