Amy, Star's been on Science Diet her whole life, seems to be pretty healthy. Sherman eats it now too, but his breeders used and recommended Diamond pet foods. I tried it but it didn't seem to agree with Star so I switched back. Since she's getting older, I may switch to a lower protein food, too. I'll keep following this thread and see what foods are recommended based on people's experiences. (BTW, my 16-year old cat has kidney problems and the vet recommended switching him to Science Diet Senior, less protein, and it seems to be working well for him.)