It's amazing how many diabetic felines are put on these "special kibble diets" from the vets office. High carb diets aren’t the greatest for a feline diabetic. With a raw diet we’ve seen insulin dependency decrease and in some cases have heard of temporary and sometime permanent remission. The only caution is that this diet be administered and monitored by a qualified vet. Let your vet know what you are doing.
Hepatic lipidosis becomes a serious concern once an overweight cat has gone without food for 48 hours. Hepatic lipidosis is a condition in which fat accumulates in individual liver cells and is a real risk for overweight cats that stop eating altogether. Without food, the body starts sending fat cells over to the liver to process lipoproteins for fuel. Lipoproteins are composed of a simple protein and a fat component that carry fats in the blood. Left untreated, the liver can fail and the cat can die. Veterinary literature suggests that about 70 percent of cats will recover from hepatic lipidosis if they are hospitalized and fed via tube feedings. Who wants to put their cat through that? No one. So, again, remember that starving an overweight cat is not an option. They cannot "live off their fat". Their fat, in fact, can kill them. So be mindful of this as you approach a sensible weight loss program for your fat cat.
If your cat likes cooked meats, put a small amount on top of the raw food. Parmesan cheese works well for getting some cats to dig in. A very small amount of the juice from canned tuna in water can work but please use this sparingly and remember that your cat should never eat tuna for long periods of time, as it can rob the cat of Vitamin E and cause a painful condition called steatitis. If you must (although this is certainly not a first choice), grind your cat's favorite dry food in a clean coffee mill and sprinkle a small amount on top of the raw food. Decrease the amount of dry food you use this way as quickly as you can.
A sprinkling of "liver flakes," that you can purchase at some pet food stores, is also a very tempting way to persuade your cat to dig in. With all these ideas, bear in mind that some cats instantly take to raw with little or no fuss. Younger cats, especially, seem to adapt very quickly to the new food. Even some older cats eat the food with no protest and seem relieved that you've finally figured out how to feed them fresh, real food that is much closer to what Mother Nature intended than anything you serve out of a can or a bag.
Finally, keep in mind that some cats do better trying to eat a new food if you try feeding them in a new place that's quiet, private, and away from other cats in the household.