How much is too much?

"The Biggest Loser" crowned its Season 15 winner on Tuesday night, but some have criticized the show for allowing 24-year-old Rachel Frederickson to drop from 260 to 105 pounds, going from a size 20 to a size 0/2.

It's a pretty shocking transformation, as she lost 59% of her body weight -- and even the trainers seemed visibly surprised by how much more she dropped in the time between when they finished filming and the live finale.

Fans also immediately reacted to Rachel's skinny appearance on Twitter, expressing concern that she has entered an "unhealthy" zone since her time on the show. These tweets are only a small sampling of the online reaction.

Rachel appeared on "Today" this morning to talk about continuing her journey, saying "I’m not sure (I’ll maintain this weight), but I plan to try new exercises and just continue on this path and see where that takes me."

When asked to comment about the controversy, reps for both Jillian Michaels and Bob Harper declined to comment since they were not her trainers. Dolvett Quince was not immediately available.

While much talk this morning is about her controversial win, we also want to recognize all the hard work the rest of the cast put into their transformations.

Runners-up David Brown and Bobby Saleem lost 54.28% and 52.51% of their body weight, respectively -- while former "American Idol" winner Ruben Studdard showed off his impressive 119 pound weight loss during the finale.

See how the rest of the competitors look before and after their time on the show in the gallery above.

Do you think Rachel lost too much? Sound off below. 

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