A federal judge said Kraft Heinz must face a proposed nationwide class action alleging that it defrauded consumers by claiming its Kraft macaroni and cheese, one of its best-known products, contains no artificial preservatives.In a decision on Wednesday, US District Judge Mary Rowland said the Illinois, California and New York consumers leading the lawsuit plausibly alleged that Kraft Mac & Cheese contained a synthetic form of citric acid that differed from the natural variety, and also contained sodium pho ...