Cats and Carbs: An Update on Feline Diabetes

Monday, October 7, 2013 - 1:15pm
Large orange cat with yellow eyes

Guest blog by Louise Murray, DVM DACVIM, Vice President of the ASPCA Animal Hospital and author of “Vet Confidential: An Insider’s Guide to Protecting Your Pet’s Health”

Diabetes is a real problem for cats in this country, but the good news is that we now have a much better understanding of this condition, and even better, we can cure it in many cases. Best of all, we are learning how to prevent it, which is the ideal strategy for a healthy, happy cat.

Cause: It’s now believed that many cases of feline diabetes are caused by excess carbohydrates in the diet. Dry cat foods in particular can be high in carbohydrates. Cats are not designed to properly metabolize carbohydrates, and cats on dry food may become obese. Additionally, the excess of carbs forces the pancreas, the organ that produces insulin, to overwork. Over time, the pancreas can become exhausted, and lose the ability to make sufficient insulin. This lack of insulin causes diabetes.

Treatment: Most diabetic cats have not permanently lost the ability to produce insulin. In order to rest the pancreas and allow it to return to normal function, cats are given twice-daily insulin injections. It’s essential to carefully regulate diabetes so the cat receives the proper amount of insulin to restore the function of the pancreas while avoiding low blood sugar, a potential side effect of insulin treatment.  

The second essential component of treatment is the cat’s diet. For the best chance of curing diabetes, most cats should eat a canned diet formulated for diabetes, or a canned kitten food. Be sure to consult with your veterinarian regarding the best diet for your own cat.

A note of caution: Cats who refuse to eat can become very ill. Any diet changes must be made cautiously, with careful monitoring of the appetite.

For optimal treatment of diabetic cats, it may be advisable to consult with a veterinary internal medicine specialist. We have two on staff at the ASPCA Animal Hospital: Dr. Pomrantz and Dr. Frank. To find a veterinary internist in your local area go to

Prevention:  We all know that “an ounce of prevention is worth a pound of cure.” For diabetes prevention as well as urinary tract and digestive health, we advise feeding cats canned food in meals, rather than allowing them to graze on dry food. Just remember that when attempting to make any change in a cat’s diet, such as from dry to canned food, patience and caution are essential. Never allow a cat to “hunger strike,” which can cause serious illness.

For more information about keeping kitty healthy, or to make an appointment for your pet, please visit the ASPCA Animal Hospital.

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Cheryl Lee

What about the periodontal health of the cat, which is linked to heart disease? Wet food causes more periodontitis.

Cary Berkelhamer

There are products to help with periodontist.Plaque-Off! Just add to food. BRUSH HER TEETH. I know it's heard but with patience you can do it.

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Actually dry food is worse for teeth, contrary to popular belief. The refined carbohydrates (of which there are more in dry food) stick to pre-existing plaque and tartar very heavily. Dry food does not "knock" tartar off teeth, only the scraping action of teeth on hard surfaces like bones or hard chew toys can knock tartar off teeth. Dry food knocking tartar off teeth is like saying that eating cheetos knocks tartar off teeth. A good product for dental health is "Biotene Veterinary Water Addtivie" its an enzyme formula with no taste, that helps break down existing plaque and tartar. It contains no antiseptics or antibacterials like chlorhexadine (which some companies shockingly use in dental products -fyi animals should NOT be consuming antibacterials! its terrible for the liver). Cats can be finicky about tooth brushing, if they absolutely will not cooperate, you can just use a cloth to wipe the teeth down, this at least wipes off newly forming plaque and tartar.


Thanks Emma!! :)


My cat was diagnosed in January with diabetes. Her back legs weren't working well and I was told it was neuropathy due to the diabetes. After an expensive week at the vet with blood sugar level tests, the "prescription diet" they sold me, and the purchase of insulin (which is pricey!!) I began doing research. I switched my cat to a quality grain-free diet amd within a week or two she no longer needed insulin. (I give her primarily dry food, by the way.) Periodic checks of her blood sugar levels have been consistant AND the neuropathy disappeared after a couple of weeks. Perhaps we caught the diabetes earlier than I initially thought. Perhaps the cat was just lucky. But I'd recommend a grain-free diet for all cats now that I've seen health improvements in all my cats on the diet.


My Orange Tabby "Sherbert" is a sugar Kitty.
We are very blessed to have this special one. He was a rescue. He became huge. He was diagnosed last March. I know make my own cat food. I have a blog about this. with Resources, Recipes and such.
There was very little info available ablout this. I was running blind. But Sherby is now stabilized. He still is partially crippled, but he has adjusted quite well.


What is the link to your blog? I have a huge cat that is just getting bigger. I had him tested for just about everything but I don't think diabetes. I'm going to pursue.