No, none at all. But, I feed 4 or 5 different "cans" AM and PM and no one eats just theirs. It's like a buffet :0)
Have done this since they were kittens and we never have any issue with food change.
Okay, thanks. I would love to be able to feed a variety but the tiniest change causes diarrhea becuase of the Tritrichomonas parasite. One of the foods they eat that they have eaten since they were babies has now added wheat and it will be just like a total new food to them. Like my Vet says, they even react to stuff that is supposed to be good for them :? I will give it a try and tell you how it goes.