I am not a food expert or professional, I've just done a lot of research and reading. This book, "Your Cat: Simple New Secrets to a Longer, Stronger Life" can be found on Amazon.com
It helped me a lot with my boy cat who used to have urinary tract problems and still tows a line with a little higher blood sugar.
We switched to all non-grain canned food and some cooked chicken and his blood sugar dropped to normal in two weeks when he was about 7 years old. Now that he is ten years old his blood sugar is going up a bit so I'm looking into raw feeding but we never seemed to be able to do this successfully in the past.
This year we added "The Honest Kitchen" cat food that is even higher in protein than the canned (20 more grams) and I've just ordered freeze-dried raw from "K-9 Naturals" (their cat food). The freeze-dried raw is even higher in protein (about another 20 grams) than "The Honest Kitchen".
If we do decide to buy raw, I am looking into a food supplement to add to the raw for cats from "Feline Instincts". I just bought the owner of this company's book, "My Natural Cats" from her site.
I am convinced that the better diets have saved us a tremendous amount of time and money over the years. The boy cat used to be "addicted" to kibble and developed urinary tract problems at 1 year old. The struvite crystals were so large we could see them in the test tube from the emergency clinic -- no need for microscope!
We don't feed kibble anymore. Our cats are only indoor cats. Of course, msvette2u's cats eating mice is the true raw diet!
Hope this helps.