I'm sorry to hear this. I don't know much about diabetic cats but I have read articles that say that sometimes if they start eating a very high protein diet that has very few carbs that sometimes it can be reversed. I currently feed my cats Innova Evo which is a grain free very high protein food. It comes in dry and canned food and my cats love it.

The only thing that some cats have a problem with is that since it's low in fiber some may not be able to digest it as well so they either throw it up or have loose stools until they're more used to it. I solved this problem by adding more fiber to their diets. Canned pumpkin, squash, sweet potatos or yams are all very good sources of fiber. I was able to find a canned grain free food that already contains butternut squash in it so this has helped to solve my problem. I also give my cats Vita Kitty chicken Breast treats which are grain free and very high in fiber every couple of days. You can buy these foods and treats at an independent pet store. Good luck.