If the protein is not much different between the two, then it must be because of the other ingredients of regular food. Kitty seems to be getting upset suddenly ocassionally eating his renal. Might be because of some vitamin additives I put in; as well some probiotic (4 strain-capsules). Gonna feed him the renal w/out adding anything and see if it stops. Seemed okay for a while, but maybe he's grown out of it. Sure can be a juggling game at times!

David