I see.

[she nods, deciding to not say at the moment, technically, he was drinking tea with one in the room.]

Caution is admirable, but if you insist on never taking food from them, you'll only be eating your own cooking from here on out. Therefore, I say simply be aware of what you choose to patronize, and use your own discretion.

Or, if you wind up feeling ill in the future, call me if you can manage it.