The Biggest Loser (season 4)

The Biggest Loser (season 4) is the fourth season of the NBC reality television program The Biggest Loser. The season premiered on September 11, 2007 with eighteen overweight contestants competing to the lose the most weight on the program. However, only twelve of these eighteen were allowed into the game after being chosen by trainers Bob Harper and Kym Lyons. Unbeknownst to them, but the six not chosen were being trained by returning trainer Jillian Michaels. This is the first season hosted by Alison Sweeney.

This season was preceded by Season 3, and followed by Season 5: Couples on January 8, 2008.