The Reality of the Biggest Loser is on Netflix, find out why host Alison Sweeney left the show and what she does now.

Alison Sweeney began hosting The Biggest Loser in Season 4, taking over for Caroline Rhea. “As host of the show, it was my job to be there for the contestants and encourage them to talk about some of the harder things that are embarrassing and hard to talk about,” Sweeney said in the documentary.

The Reality of The Biggest Loser' featured 'The Biggest Loser' host Alison Sweeney as she talked about her experience on the show.

The Biggest Loser' hooked millions throughout its 18-season run. Now a Netflix doc is reflecting on its complicated legacy. Before you stream it, see what its famed trainers have been up to since leaving the controversial series.

Bob Harper and Jillian Michaels were a dynamic duo for 13 seasons of The Biggest Loser, but when Harper suffered a near-death experience, Michaels was nowhere to be found. That’s what Harper, one of the weight-loss show’s original trainers who eventually hosted the final two seasons,