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.

Among other claims, Netflix’s “Fit for TV: The Reality of the Biggest Loser” alleges Michaels plied contestants with caffeine pills even though they were supposedly banned, restricted competitors’ calorie intakes to dangerously low levels, and denied medical care and medicine to some.

Jillian Michaels is punching back at “The Biggest Loser” alumni who made claims against her in the Netflix documentary “Fit for TV,” which explores the “dark side of the NBC reality series.” Michaels was a fitness trainer on the weight-loss competition series from 2004 to 2011,