Fortunately, I found quick answers to this search I plugged into Google within an hour of Vince's arrival this evening.
"Vince" is staying with us for a month or two from southeast China. The little movie I just watched online assured me, as a host-mom of a Chinese student, that they eat everything. In fact, she said they have a saying for people from the southern part of China: "They eat everything with legs except the table and chair."
Nice! Maybe this will rub off on my own "Nutella sandwich - honey and butter sandwich - olive oil sandwich" threesome.
I'm off to make some sort of Tupperwared lunch for the kid to take tomorrow. After that, maybe a trip to the grocery store to find at least a couple things he'd find as comforts from home. If he's at all like our Chilean exchange student, it'll be something horrifying and all-too-American like Cocoa Puffs.