It's not the jingle the company may have been looking for, but a fast food chain known for its healthy fare may be serving up a fitness-related element its customers never intended to eat.

Subway is announcing that it will remove a chemical that is used in shoe soles and yoga mats from its dough. The chemical, azodicardonamide, helps produce air within the foam of things like athletic equipment and, as it turns out, bread.

The use of the fluff-making fodder was uncovered by Food Babe bloggist Vani Hari, whose petition designed to get Subway to discontinue use of the additive received tens of thousands of signatures. Despite the fact that azodicardonamide is banned throughout Europe and Australia, it is still legal in the United States.

Company officials have responded by saying that, even before Hari's petition, they were already planning to remove the chemical.

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