Subway Bans Azodicarbonamide, But Will Azo-Free Foods Catch On And Should They?The latest chemical that you didn't know you needed to avoid eating is now already removed from one fast food chain's products, and could soon be removed from many more, although the FDA allows its use. The chemical is azodicarbonamide and Monday, Subway restaurants announced all of its bread was "azo-free."

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