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."

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.

Michaels took to Instagram to dispute claims that she restricted contestants’ diets to extreme degrees and broke show rules.