Dr. Robert Huizenga fired back at Jillian Michaels ’ claims after she accused those involved in the new Netflix documentary, Fit for TV: The Reality of the Biggest Loser, of lying about the use of caffeine pills on the show.

In the docuseries, Michaels' former costar, Bob Harper, and others affiliated with the reality show, accused Michaels of unethical behavior, such as having bullied contestants, given them caffeine pills in an effort to lose weight faster, and restricting their calories to unsafe levels.

The former trainer on the weight loss bootcamp series hits back at claims made in a new Netflix docuseries, 'Fit for TV: The Reality of the Biggest Loser.'