Probably most of the stuff you eat, actually. We don't have the necessary organs to digest tough plants or grass.

[ Which must be the sort of thing Louis eats, if he has the same diet of a deer despite his human body, right? At any rate, he nods his head for them to keep browsing the market and eats another shrimp. ]

Not to mention, most people think vegetables don't taste good and eat them just to be healthy.