You might find it helpful to read up on feline nutrition at
Cat Info We encourage low carb canned or raw food.
Keep everything the same until you can do blood testing, since you are giving insulin! Food changes may drop the glucose level 100 points or more, changing the required insulin dose.
You might not be feeding your cat enough.
You might not be giving enough insulin.
Or a combination of both.
Diabetic cats can't use what they eat unless the insulin dose is optimized. Insulin allows the glucose to be used by the body.
We can't really figure it out without more information from you - blood glucose levels, urine ketone levels, size of cat, type and dose of insulin.
Are you testing for urine ketones? These ocurr when fat is breaking down for energy. Too many ketones result in diabetic ketoacidosis, a potentially fatal complication of diabetes which is very expensive to treat. See my signature link Secondary Monitoring Tools for info on how to do this, as well as other ways of assessing your cat.
Here's a little light reading from
AAHA on managing feline diabetes. I encourage you to read it over and share it with your vet.
You can test your kitty at home with an inexpensive human glucometer, such as the WalMart ReliOn Prime, Vital, or Confirm. These 3 are inexpensive, have inexpensive test strips, and the generic version of these is available from our shopping partner ADW (link at top of page). You'll need lancets which are about 26-27 gauge to test the blood.
We strongly encourage blood glucose testing to make sure it is safe to give insulin and to monitor control of the diabetes.
