Jillian Michaels didn't get along with every contestant on "The Biggest Loser" ... but, that doesn't mean she was handing out caffeine pills like a new documentary suggests -- so says one of the OG Losers.
We spoke with David Fioravanti -- a contestant from the first season of the show -- and, he details his contentious relationship with the fitness trainer and former coach on the show.
Fioravanti says he came into the show with a basic level of fitness knowledge ... so, he didn't follow everything Michaels said without question.