"There were times challenges were done that I didn't see or hear about," the doctor claims in Netflix's new docuseries 'Fit for TV: The Reality of The Biggest Loser'

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

The Biggest Loser became a cultural phenomenon when it premiered in 2004 — but the show has been plagued with scandals and controversy

Michaels was a trainer on “The Biggest Loser” for seasons 1, 2, 4-11, 14, and 15. She often motivated contestants by yelling at them or insulting them. In one clip from “Fit for TV: The Reality of the Biggest Loser,” Michaels pushes a woman to keep exercising even after she vomits on a treadmill.

Netflix viewers have reacted in disbelief over 'outrageous' documentary Fit for TV: The Reality of The Biggest Loser, which lifts the veil on the TV series.

The Biggest Loser 's former host Alison Sweeney and trainers Bob Harper were not fans of one of the show's most controversial challenges.

The Biggest Loser franchise has mourned the deaths of some of the show's contestants over the years. NBC debuted the reality series in 2004, which followed a group of people deemed overweight who would compete in a 30-week competition.