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…