To pre-empt the inane pedantic reactions that always seem to accompany discussions on such articles: yes, water is a chemical too, as are vitamins, etc.
When people talk about "chemicals in food" they mean additional, lab created stuff added to the food, like artificial sweeteners, additives, preservatives, coloring, remains from the production and transportation process, etc.
Those against "chemicals" in food obviously don't advocate for food made without any kind of molecules and chemical substances.
Amazingly not only functions can be overloaded, but words too.