Hi Roy,
Hillary has already hit the high points and where your vet is completely wrong, so I'm just going to add a little information about my diabetic cats. My original diabetic was Muse (thus the screen name). I found this group when she was first dxed, but unfortunately it was too late for her, she passed shortly after finding out finally what was wrong with her, due to cancer, since diabetes was only the tip of the iceberg for her. But I hung around and started gleaning all the information I could from these wonderful folks as I never wanted to get the kick in the gut that I did with my lovely Muse. You see I had at the time 8 other cats, that I wanted to keep healthy and happy. Since that time, our furry family has expanded some, with the addition of 3 more non-diabetics and through this board a wonderful 12 year old fellow named Maxwell. I adopted Maxwell with only 24 hours left to live as he had been surrendered to a vet to be put to sleep when his owner went into a nursing home and her family didn't want to be bothered with caring for him. Maxwell was in rough shape when he arrived at my house, he had been shaved naked because he was so matted, he was a walking skeleton at 10.5 lbs (he's a very large framed cat), and did very little jumping or playing. This was on October 15th last year, within 2 weeks of changing his diet (along with all my cats) to a low carb, high protein diet, Maxwell was in remission and completely off insulin where he remains to date. And all 10 of my other cats look better than they ever have. Their coats shine, they are sleek and muscular, with abundant energy, they run, they jump, they wrestle, and even my one that had cronic diarrhea stopped and another one with severe food allergies had those disappear and went of the daily pred that he had been on for nearly 6 months.
However, if I hadn't been testing Maxwell at home, I could have seriously hurt him, because he was so new to me at the time of him going into remission that I wouldn't have catch the subtle personality shifts that signal the onset of hypo, I didn't know what was normal for him. In fact I didn't learn what was normal for him until several months later once he was off insulin and regained all his weight back. He is my only senior cat, at the moment, but today you can't tell the difference in him and any of his younger housemates, except for the fact that he actually will sleep at night with us in the bedroom, while the kids are up and prowling around the rest of the house, he is still just as playful and active as the rest of the fur gang here. In fact his best friend is my Lady Jane Grey, who isn't even a full year old yet.
If fact this is such an easy disease to treat at home, that I'm waiting on transport right now for my second adopted diabetic kitty, who I will again be putting on an all canned low carb diet (she is already being switched in her foster home), and testing her religiously at home, and with any luck will once again be back here celebrating her going off insulin as well.
Her name is Musette and her foster dad has been sending me her weekly testing results, so you call look at both Maxwell and her spread sheets in my signature and see how quickly her numbers are starting to fall with less that 1u twice a day and a change in diet. Musette just has a harder road to hoe than Maxwell did, as Maxwell was in pretty good condition and was a fairly new diabetic when I adopted him. Musette has already been through DKA in March, and is currently being treated for a UTI, which is making her a little harder to regulate.
I feed everyone here exactly what my diabetic eats, Friskies Pate style canned food, because out of 9 cats when Muse was first dxed not a single one of them would touch the prescription stuff, and I have one that is an ex-feral and will raid a trash can like a dog, and even he turned his nose up at that stuff. Now I am home with my furry kids all day so I feed them four times a day, but when I have to be gone over their normal feeding times, I simply freeze their canned food with a little bit of water mixed in it and leave that for them to nibble on as it thaws.
Mel, Maxwell & The Fur Gang.