The Biggest Loser was back in the spotlight in 2025 thanks for a Netflix docu-series that took a critical lens to the long-running NBC series.

The competition series followed overweight and obese people competing to lose the most weight in order to win a cash prize, but also transform themselves in the process.

Across 18 seasons, including one that aired on USA Network, hundreds of contestants lost thousands of pounds collectively on the show.

We’re now looking back at all 18 winners throughout the years and who lost the most weight, based on percentage of body mass lost.

Browse through the slideshow to see all of the before and after transformations for all of the Biggest Loser contestants…

Jillian Michaels is saying that there is no truth to a comment made by a former The Biggest Loser winner in the recent Netflix docu-series Fit for TV.

In the docu-series, the winner of season one claims that Jillian whispered to him at the finale that he “made her a millionaire.”

Jillian says this isn’t true.

“I was wearing a mic, so like, there’s this, apparently there’s a contestant from season one, which is 21 years ago, who magically remembers this moment where I jump into his arms,” Jillian began in an interview with Fox News.

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Jillian Michaels has already made it clear that she’s not happy with the Netflix docu-series Fit for TV and now she’s speaking out again.

The former The Biggest Loser personal trainer did not participate in the documentary, even though her counter-part Bob Harper and longtime host Alison Sweeney both gave interviews.

“Zero regrets about not doing it because I would have simply lent credibility to something that is an egregious lie,” Jillian told Fox News in a new interview.

Jillian is debating whether or not she will actually sue the producers of the docu-series.

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Rachel Frederickson lost the most percentage of weight among all the winners of The Biggest Loser and now she has been spotted for the first time in years.

The former reality show contestant has been back in the headlines amid the release of the Netflix docu-series Fit for TV: The Reality of The Biggest Loser. While on the show in 2014, Rachel lost 59.6% of her body weight. She went from 260 pounds to 105 pounds, dropping 155 pounds.

Rachel‘s weight loss sparked backlash at the time, with critics saying she took the show too far and lost too much weight. She ended up gaining 20 pounds quickly after the finale to reach her “perfect weight,” which she revealed in an essay that she wrote to respond to the controversy.

New photos show Rachel in 2025, over a decade after winning the show.

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Rosie O’Donnell shared her thoughts on Fit for TV: The Reality of the Biggest Loser, Netflix’s new docu-series on The Biggest Loser.

In two separate posts, the 63-year-old former talk show host and comedian shared her thoughts on Jay Leno, as well as The Biggest Loser‘s Bob Harper.

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Tracey Yukich was a contestant on the eighth season of The Biggest Loser and she claims she “died” while competing in the first challenge of the show.

For the 8th season, producers made all of the contestants run a mile along the beach to earn a spot on the show. Anyone who didn’t complete the run would be automatically eliminated from the season.

Tracey thought she would be able to finish the run without an issue, but she ended up having a medical emergency during the challenge.

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The Biggest Loser became a worldwide phenomenon in the early 2000s and changed the way that a lot of people looked at weight loss. Now, the show is under scrutiny after Netflix released the docu-series Fit for TV: The Reality of The Biggest Loser.

The docu-series is putting a critical lens on the long-running series, which ran for 17 seasons on NBC and one final season on USA Network.

The competition series followed overweight and obese people competing to lose the most weight in order to win a cash prize, but also transform themselves in the process. Across the 18 seasons, hundreds of contestants lost thousands of pounds collectively on the show.

We’re taking a look at the before and after for every winner, from the first season in 2004 all the way to the final season in 2020.

Browse through the slideshow to see all of the winners’ before and after photos…