NBC's The Biggest Loser has produced some truly incredible transformations over its 15 seasons. Many contestants lost half their body weight -- or more, as in the case of season 15 winner Rachel Frederickson. Take a look back at the some of the show's most jaw-dropping makeovers.
Ryan Benson - Season 1 - After
After his stint on the show -- his efforts netted a 122 pounds-slimmer Benson $250,000 - the actor told Time magazine he gained a reported 30 pounds back in five days just by drinking water.
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