People feel so passionately about food that perhaps it is not a surprise it has yielded that rarest of things: A sequel to a documentary. The makers of 2008’s “Food, Inc.,” are, as the new movie’s tagline goes, back for seconds with “Food, Inc. 2,” a multi-layered look at the food industry, its farmers, workers, scientists, journalists and more. Co-directors Robert Kenner and Melissa Robledo are here to talk about it, from soup to nuts.

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