Dr. Huizenga Disputes Jillian Michaels' Claims, Insists Caffeine Was Banned on Show

Dr. Robert Huizenga isn’t about to let Jillian Michaels dominate the narrative -- he's firing back after she ripped him over Netflix's "The Biggest Loser" documentary ... telling TMZ her "receipts" don’t prove a thing. Huizenga tells TMZ ...…