Well he can only eat Cibo that has mais starch I think but for now Zim can only eat cialde but later he might get sick.But he might not if they aren't made da Gir.Who knows what he put in them.
ZIM HATES ALL EARTH Cibo THEY CAUSE HIM PAIN!!! for example beans make him ooze green slime and make his head all big, water(i think that counts as a food) feels like acid to irken people, BUT HE LIKES cialde TO SOME EXTENT