Rosie O'Donnell slams Jay Leno over past treatment of 'Biggest Loser' contestant

Rosie O'Donnell is slamming Jay Leno over his past behavior toward a contestant on "The Biggest Loser."

On Tuesday, the 63-year-old comedian and actress took to Instagram to vent her frustration after watching the new Netflix docuseries, "Fit for TV: The Reality of the Biggest Loser."

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.

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Rosie O'Donnell slammed Jay Leno over his past treatment of a contestant on "The Biggest Loser." (Alberto E. Rodriguez/Getty Images; Rodin Eckenroth/Getty Images)

"jay leno is a mean a--hole #biggestloserdocumentary," O'Donnell wrote in the caption of her post, which featured screenshots from both the docuseries and "The Tonight Show."

The docuseries included an archival clip from Yukich's appearance on Leno's show, during which Leno read scathing comments and death threats directed at her that "The Biggest Loser" fans had submitted to the show via email. 

In one comment, a viewer described Yukich as "just pure evil." Leno read an email from another fan, who wrote, "I would not step on the brake if I saw you cross the street. I want to accelerate."

"She wants to kill you, but she won't use a swear word," Leno told her.

Yukich appeared on "The Tonight Show" in 2009.  (Stacie McChesney/NBCU Photo Bank)

In an interview that was included in episode three of the docuseries, Yukich cried as she recalled the experience. 

"These are emails that people actually sent to the show," she said. "It was so bad. I was like, wow. My feelings were so hurt. They were. I didn't know that I was a villain until the show aired."

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Yukich is pictured at the beginning of season eight on the reality TV show.  (Trae Patton/NBCU Photo Bank/NBCUniversal via Getty Images)

O'Donnell also blasted "The Biggest Loser" trainer Bob Harper in another post on Tuesday, writing, "ok now bob harper - can u not say IM SORRY - seriously- so hurtful- so cruel - come on bob - #biggestLOSERdoc @netflixuk." In the post, she included screenshots from the docuseries featuring Harper and season 7 contestant Joelle Gwynn.

Fox News Digital has reached out to representatives for Leno and Harper for comment. 

During an interview on "Fit for TV," Harper defended his behavior towards the contestants.

"Always remember we were trying to make an entertaining show," he said. "What’s more important for weight loss? We all know it’s diet, but that becomes boring television."

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Trainers Jillian Michaels, right, and Bob Harper clown around before the taping of a weigh-in for the show "The Biggest Loser," October 14, 2010. (Todd Feeback/Kansas City Star/Tribune News Service via Getty Images)

"You know what’s not boring television? To see us in a gym yelling, screaming... and producers loved that s---. They were like, ‘We want them to puke! We want the madness of it all!’" Harper added.

Harper admitted that he regretted some interactions with the competitors, including a moment in which he yelled at Gwynn.

However, he said that he "will stand behind everything that I’ve ever done on that show" and also indicated that he "would never put anyone in harm’s way."

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"The Biggest Loser" ran for 18 seasons from 2004 to 2020. The show followed groups of people who competed to lose weight over a 30-week period for a cash prize, with the winner being crowned "the biggest loser."

Harper, shown with a contestant, was a trainer on "The Biggest Loser" before becoming host. (Justin Lubin/NBCU Photo Bank/NBCUniversal via Getty Images)

According to a plot synopsis from Netflix, the three-part docuseries featured interviews with "former contestants, a longtime host, and producers about what went on behind the scenes throughout the 18 seasons, reflecting on the success of the show and its lasting impact." 

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"Those who participated on ‘The Biggest Loser’ also divulge the extremes they were guided to take in order to lose weight and the effects they’ve lived with since then — from disordered eating to mental health issues," the logline added. 

"Fit for TV: The Reality of the Biggest Loser" premiered on Aug. 15 and is currently streaming on Netflix.