Documentaries have increasingly been gaining traction in the film world, and this year’s Sundance Festival was no exception. From a horrifying first-person look at what happens to the human body when it is fed nothing but food from McDonald’s, to an intimate look at “a roiling skirmish between Latin immigrants and the Long Island natives who’ve lived in a small town for generations,” the documentary made a serious mark in Park City. “The scope and depth of this year’s documentaries made the fiction features seem all the smaller and more navel-gazing.”