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

Season 15 winner Rachel Frederickson lost nearly 60% of her body weight, shocking viewers and health experts at the time. Fit for TV: The Reality of The Biggest Loser, a documentary about the show's complicated legacy,

In an Aug. 19 Instagram post, she called out fellow TV icon Jay Leno for a mean-spirited 2009 segment from "The Tonight Show with Jay Leno," which was revisited in the new Netflix docuseries " Fit for TV: The Reality of the Biggest Loser ."

Discover shocking truths about 'The Biggest Loser' scandals and bitter trainer feuds in a revealing new docuseries

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

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

The Biggest Loser is back in the spotlight more than 20 years after it first premiered on NBC. In the new Netflix docuseries Fit for TV: The Reality of The Biggest Loser, former contestants and producers reveal the intense reality behind the success of the weight-loss reality show.

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