US renounces the request to change the name of high-fructose corn syrup to 'corn sugar'.
The effort to change the name comes amid controversy over the sweetener, which is at the epicenter of a dispute over a possible link to obesity.
The Food and Drug Administration said in a ruling that the corn industry failed to back up its request for the name change.
FDA food safety chief Michael Landa said the change would imply "a solid, dried, and crystallized sweetener obtained from corn."
Landa said there is already a solid corn sweetener, called dextrose, and that the liquid corn sweetener contains some ingredients that might adversely affect people "with hereditary fructose intolerance or fructose malabsorption."
The regulatory battle between Big Sugar and Big Corn coincides with a public relations battle.
The FDA affects food labeling but does not prevent advertisements describing "corn sugar," at least according to the corn industry.
The two sides have offered contradictory scientific studies. A 2008 report by the American Medical Association which concludes that it is "unlikely" that high-fructose corn syrup contributes more to obesity or other conditions than sucrose.
But a 2011 study cited by the sugar industry from the journal Metabolism concludes the fructose corn syrup leads to "significantly different acute metabolic effects" than plain sugar.
Some have linked the obesity epidemic to consumption of processed foods and soft drinks which use corn syrup in place of costlier cane or beet sugar.
The corn industry petitioned the FDA for permission to use the term "corn sugar" instead of high fructose corn syrup. But in the meantime it has launched television and print ads hoping to gain public support, on free speech grounds.
The campaign cites experts saying there is no difference between various sugars in terms of metabolism, calories or other nutritional values.
"Whether it's corn sugar or cane sugar, your body can't tell the difference. Sugar is sugar," one ad says.