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Diabetes mellitus is a chronic disease in cats whereby either insufficient insulin response or insulin resistance leads to persistently high blood glucose concentrations. Diabetes affects up to 1 in 230 cats, and may be becoming increasingly common. Diabetes mellitus is less common in cats than in dogs. Eighty to ninety-five percent of diabetic cats experience something similar to type 2 diabetes but are generally severely insulin dependent by the time symptoms are diagnosed. The condition is treatable, and if treated properly the cat can experience a normal life expectancy. In type 2 cats, prompt effective treatment may lead to diabetic remission, in which the cat no longer needs injected insulin. Untreated, the condition leads to increasingly weak legs in cats and eventually to malnutrition, ketoacidosis and/or dehydration, and death.