The Biggest Loser is back in the spotlight, over 20 years after the show took the world by storm and changed the way people looked at weight loss.
The NBC 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.
In 2025, Netflix released a three-part docu-series, Fit for TV: The Reality of The Biggest Loser, which takes a critical lens to the long-running series.
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…