You can find some low carb pure protein treats to replace the crunchy texture Gypsy Lee used to get. A couple of products I use are the Pure Bites freeze dried chicken treats or the Halo LIv-a-Little freeze dried chicken or salmon treats or the Whole Life freeze dried liver treats. Look in the dog aisle of the pet specialty stores like Petsmart or Petco for larger bags of these treats to save a bit on the cost.
I break off a tiny piece, about corn kernel size, and give each of my 3 cats a couple of bites of a tasty treat. Since Wink went OTJ he misses his treat during our daily tests so I still give him a treat now and then. Don't over feed the liver ones because I understand that organ meats can contain some carbohydrates. One a day is my selected limit for the organ meat ones.
These treats can also be crumbled and sprinkled over the wet food if your kitty's appetite is a bit off. I do this when Wink doesn't seem to want to eat much, to tempt him a bit with a yummy taste to get him to eat a bit more.
That vet journal I quoted also talked about watching for a fasting BG of over 117 being of concern for cats in remission.
A recent study of diabetic cats in remission found that fasting glucose concentrations greater than 6.5 mmol/L (117 mg/dL) or glucose concentrations greater than 6.5 mmol/L (117 mg/dL) 4 hours after a glucose challenge (1g/kg) were predictive of relapse. Suggesting that cats with glucose concentrations greater than 6.5 mmol/L (117 mg/dL) should also be considered pre-diabetic.
Since I can easily measure fasting glucose in the morning because of the feeding schedule I use, I plan to test weekly for Wink and if his numbers start to creep up again, over 100, I'm going to try some of the ultra low carb foods with <4-5% carbohydrates to see if that helps to lower the numbers again. Some people with OTJ cats may only test every couple of weeks or once a month or every few months. Since Wink is newly OTJ, I prefer to be more vigilant to catch a BG rise as quickly as possible.
I think my first cat may have been a transient diabetic, he was on and off insulin all the time and had every problem you could have with it. That was 15 yrs. ago and I didn't know the food issue and I know I could have done so much better with the knowledge I have today, but he lived to be almost 19.
Even the vets 15 years ago did not know about the food issue. Lots of vets even today are still advising their diabetic cat owner clients to feed high fiber diets instead of the low-carb option that studies have shown is more beneficial. Even the AAHA Diabetes Management Guidelines for Dogs and Cats, a vet journal article published in 2010 recommends feeding diabetic cats the lowest carb content the cat can tolerate. Here is that link for your reading pleasure.
http://www.aahanet.org/PublicDocuments/AAHADiabetesGuidelines.pdf
Unlike vets who have to deal with so many different types of animals and a wide variety of diseases, illnesses, accidents with their clients, we are concentrating on diabetes management. Because of that, we can spend the time to do more intensive research and find the latest vet research and tend to be more current than many vets. We also have a lot of detailed day-to-day practical experience here on this message board that a vet could never have all that information at their fingertips. We also have multiple members chiming in on a topic and that brings the peer review aspect kicking in to get differing experience levels.
Remember, "Once a diabetic, always a diabetic". Good luck with Gypsy Lee and here is hoping for a continued remission for her.