Welcome, was your cat prescribed insulin? what insulin? Diabetic cats need to have a diet of wet can or raw foods between 0-10% carbs, most members feed Fancy Feast Pates between 0-10% carbs, most feed up to 5%, a
link for a carb food calculator below, you will use the nutrient of the food on the label, we are looking for Dry Matter carbs,
food list link below, the third column contains the carb %, a diabetic cats should have at least 3-4 small meals or snacks during the day as well as the main meal before shot, also home testing is suggested, testing before each shot is important to avoid hypoglycemia and at least 3-4 times during the day, most members use the ReliOn human meter and strips (Walmart) or any human meter, no need to spend on a pet meter, they are expensive and the strips are very expensive, and the human meter is just as accurate, we base our numbers on them as well. A non-diabetic glucose level is between 50-120, once your cat begins insulin and feeding schedule, he should begin to gain weight, you can get an idea of a feeding schedule and what food I feed Corky, by clicking on Corky's Spreadsheet below in blue, and scrolling the SS to the left you will see when what I feed and how often, to get an idea, before diagnosed he was weighing 16.5 lbs., he is a very large cat, when diagnosed he was weighing 8.5lbs he quickly regain his true weight in about 2 months or so, Please keep posting, no concern is a small one, let us know what insulin you are using
Carb Calculator - Felinediabetes.com