Kraft Heinz is grappling with a problem that can’t be solved by increasing efficiency: U.S. sales of cold cuts and other processed meats slipped to $21.3 billion last year, from $21.9 billion in 2015. Oscar Mayer’s market share dropped to 17.5% from 18% five years ago, according to Euromonitor. Natural and organic brands, as well as small labels buying from local farms, have nibbled away at sales.