Cat Food for Diabetic Cats
What the Cornell Feline Health Center says about diet for diabetic cats - low carbohydrate, often wet food, slow weight loss, remission with early treatment - and two prescription low-carbohydrate diets compared on what their makers publish. A reading guide, not veterinary advice.
AI illustration This is a reading guide to published veterinary information and to what makers state on their own pages. Cornell describes diet and insulin as two parts of one treatment, so change a diabetic cat’s food only with your vet.
The short answer: a low-carbohydrate diet, chosen with your vet. The Cornell Feline Health Center says a diet low in carbohydrates has been shown to improve blood sugar regulation in diabetic cats. It names several prescription options in both wet and dry form, and adds that a wet-food-only diet may benefit many cats. For an overweight cat, slow, controlled weight loss under close veterinary monitoring helps control blood sugar.
What Cornell Says About Feline Diabetes
- The signs. The two most common signs owners notice are weight loss despite a good appetite, and more thirst and urination.
- The risk factors: obesity, increasing age, physical inactivity, male sex, and steroid medicines (glucocorticoids). Cornell says obese cats are up to four times more likely to develop diabetes than cats at an ideal weight.
- The treatment: traditionally insulin plus diet. Cornell adds that a newer class of once-daily oral medicines, SGLT2 inhibitors, approved in 2023, may suit some cats.
- Remission. There is no cure, but with early, aggressive treatment many cats go into remission and keep normal blood sugar without insulin. Cornell says the most important factor is starting insulin early and monitoring closely.
- Meal timing. Cornell says many vets recommend feeding at the time of each insulin injection, though it notes there is no definitive evidence that this prevents low blood sugar. On a low-carbohydrate diet, it says, grazing may be acceptable for some cats, especially on a longer-acting insulin.
Two Prescription Diets Compared
| Diet | Form | What the maker says it is for | Protein | Energy | Source |
|---|---|---|---|---|---|
| Hill’s Prescription Diet m/d GlucoSupport | Dry (wet also sold) | Glucose management; Hill’s lists carbohydrate at 15.1% of dry matter | 52.6% of dry matter (fat 21.8%) | 463 kcal per cup | Hill’s |
| Purina Pro Plan Veterinary Diets DM Dietetic Management | Dry (canned also sold) | “High in protein and low in carbohydrates to help support healthy glucose levels in cats” | 51.0% min, as sold (moisture 12% max) | 544 kcal per cup | Purina |
How we put this together. Two prescription diets aimed at diabetic cats, compared on what each maker states on its own product page, checked on 26 October 2026. Royal Canin’s diabetes page presents its GLYCOADVANCED line, but we did not find a product page with figures we could read, so it is not in the table. Hill’s states its nutrients on a dry-matter basis, without water, and Purina states them for the food as sold, so the figures do not line up directly. Both are veterinary diets: Purina’s page says “use only as directed by your veterinarian”. That is why there are no shop links here. We have not fed these diets.
At Home
- Watch the signs Cornell lists and report changes: weight, thirst and urination.
- Keep the routine your vet sets for meals and insulin. Cornell notes that if food has to be withheld, for example before an anesthetic, the insulin dose is usually halved, with careful follow-up. Your vet decides this, not you.
- Daily play. Cornell says keeping a healthy weight and encouraging activity through daily play is the most important thing an owner can do to lower the risk in the first place.
