Big sugar processors are set to take on major corn refiners including Archer Daniels Midland Co and Cargill Inc before a U.S. jury on Wednesday in a billion-dollar lawsuit that could shape how consumers view two bitter foes in the sweetener market. Several sugar refiners including global leader ASR Group sued in 2011, alleging that a corn trade group's ad campaign describing high fructose corn syrup as "corn sugar" and "natural" was false. The corn refiners countersued, saying the Sugar Association falsely claimed in its newsletter that corn syrup causes obesity and cancer.