In case it wasn't already obvious, generic food (such as kings feast, create
food, hunting, fishing, stuff you find in monsters....) support the new bonus
system. Like already stated, the identify spell can be used to tell what
effects a certain food might have. The same food always has the same bonuses,
the power just differs (the deciding factor is the food short description, so
'a warm bun' will have a different bonus than 'a tasty bun').

Rgds, your friendly neighbourhood Sage
PS. It might be worthwhile to do some research now that the bonuses are
active...