Frederickson did end up gaining back 20 pounds within a couple months of the finale. She told Us Weekly in April 2014 that she felt 125 pounds was her “perfect weight.” She also insisted that she’d lost weight “so naturally” on “The Biggest Loser.”

Erica Lugo trained 'The Biggest Loser' Season 18 winner and now, she's speaking out about her experience on the show.

Jennifer Kerns, a physician in obesity medicine and a contestant of The Biggest Loser, reveals the inner workings of the show.

Rachel Frederickson faced backlash from Biggest Loser fans for her extreme weight loss. But blame should be placed on the system that exploited her.

That discourse continues to this day, with Netflix having recently dropped Skye Borgman's documentary Fit for TV: The Reality of The Biggest Loser. Many of the series' most memorable transformations are highlighted and dissected, but not Frederickson's.

Learn how much 'The Biggest Loser' winners earned, including the $250K grand prize, at-home awards and other contestant payouts

Suzanne Mendonca, a contestant from season 2 of the show, appeared on episode 3 of Fit for TV: The Reality of the Biggest Loser. She shared that casting directors asked her to gain more weight before coming to the show, and she listened to them. She quit her diet and started eating more food.