Not a cat owner here, but I have a big black lab great dane mix dog. He has a blood disease and the vet gave him a life expectancy of under 7. I have been feeding him blue buffalo or taste of the wild (hippiy dog foods) and he is about to hit 13 years old, healthy as an ox, shedding hair like its his job, happy as a pig in poop, and mostly blind, but still alive. I like to credit his food for at least part of his health.