In one post, O'Donnell called out the 75-year-old former talk show host for his treatment of season eight competitor Tracey Yukich when she made an appearance on "The Tonight Show with Jay Leno" in 2009. JILLIAN MICHAELS SLAMS 'BIGGEST LOSER' DOCUMENTARY, PUTS CO-STAR BOB HARPER ON BLAST FOR FRIENDSHIP DEMISE

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

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.”

The Biggest Loser' was not without its flaws, but it also gave me lasting friendships and lessons,” season 14 winner Danni Allen said

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

Where are the winners of The Biggest Loser Australia now? Here’s what all of them look like and what they're up to today.

The Reality of the Biggest Loser," Danny Cahill shares his experience with the show. He shares how life is for him now.

Robert Huizenga spoke about his experience on 'The Biggest Loser' on the Netflix docuseries 'Fit for TV: The Reality of The Biggest Loser'