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 - Before
Benson, an actor now living in Los Angeles, took part in the show's inaugural series as part of Jillian Michaels' Red Team, weighing in at 330 pounds.
Credit: Trae Patton/ Abc News