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Corn grows in a field August 17, 2011 near West Union, Iowa.
A federal judge heard arguments from sugar industry lawyers who claim the makers of high fructose corn syrup are engaged in misleading advertising by calling the sweetener "corn sugar."
U.S. District Judge Consuelo Marshall said Tuesday she would issue a written ruling on a motion to dismiss the case that sugar lawyers filed.
The central claim from sugar manufacturers is that high fructose corn syrup, which is used in the bulk of sodas and processed foods, should not be called corn sugar because it is not a naturally occurring product and must be produced through technology.
The corn industry last year applied with the Food and Drug Administration for the name change. The FDA has not ruled on the petition.