Separating otherwise safe, concurrent uses of chemicals is as wrong a strategy as the Maginot Line. Organic matter is chemical matter at its base. Chemophobes Win After being pilloried in the social media by activists, the Subway sandwich chain announced it would stop using azodicarbonamide as a bleaching and conditioning agent in its bread. The complaint was that the chemical is also used in making yoga mats. Actually, it is used in the manufacture of many plastics, but the sweaty yoga mat provides a graphic image to chemophobes. One could make this ever grosser: benzoic acid is used to fight fungus in food as well as athlete's foot in humans (food odor is caused by isovaleric acid, also found in foods). Additionally:

Sodium benzoate...