Diabetes in Cats: Why Felines Are Prone and How to Manage It

Diabetes mellitus is one of the most common endocrine disorders in cats, affecting approximately 1 in 200 to 300 cats. Unlike dogs, who predominantly develop Type 1 (insulin-dependent) diabetes, cats almost always develop Type 2 diabetes — a condition remarkably similar to Type 2 diabetes in humans. In Type 2 diabetes, the body's cells become resistant to insulin, and although the pancreas may still produce some insulin, it is not enough to overcome this resistance and keep blood glucose levels in the normal range.

"Feline diabetes is unique in the veterinary world because, with aggressive early treatment, a significant number of cats can achieve remission — something that is almost unheard of in diabetic dogs." — Dr. Sarah Chen, DVM

Over time, if insulin resistance persists, the insulin-producing beta cells in the pancreas can become exhausted and damaged — a process called glucose toxicity. This is why early detection and intervention are so important in cats: the sooner treatment begins, the better the chance of preserving remaining beta cell function and potentially achieving remission. For a general overview of diabetes across species, see our comprehensive diabetes management guide.

The incidence of feline diabetes has been rising in recent decades, mirroring trends in human Type 2 diabetes. Contributing factors include increasing rates of pet obesity, sedentary indoor lifestyles, and high-carbohydrate commercial diets. Understanding why cats are particularly vulnerable is the first step toward prevention and effective management.

Several factors make cats uniquely susceptible to developing diabetes. Understanding these risk factors can help you take preventive steps and recognise early warning signs.

Obesity: The Number One Risk Factor

Obesity is the single most important risk factor for feline diabetes. Overweight cats are up to four times more likely to develop diabetes than cats at a healthy weight. Excess body fat — particularly abdominal fat — directly promotes insulin resistance. In many cases, achieving and maintaining a healthy weight is enough to prevent diabetes altogether or significantly improve control in cats already diagnosed. Learn more about the risks in our obesity risks and management guide.

Indoor, Sedentary Lifestyle

Indoor cats that lack stimulation and exercise opportunities are at heightened risk. Physical inactivity reduces insulin sensitivity and promotes weight gain — a double hit. Providing enrichment, interactive play, climbing structures, and food puzzles can make a meaningful difference. Our guide to keeping indoor cats happy and healthy offers practical tips to boost your cat's activity levels.

High-Carbohydrate Diets

Cats are obligate carnivores — their natural diet is high in protein and very low in carbohydrates. However, many commercial dry cat foods contain 30-50% carbohydrates. Feeding a high-carbohydrate diet long-term forces the pancreas to produce more insulin than a cat's metabolism was designed for, eventually contributing to insulin resistance and beta cell exhaustion.

Sex and Age

Male cats are approximately twice as likely as females to develop diabetes. Neutered males are at the highest risk, likely because neutering promotes weight gain. The condition is most commonly diagnosed in cats over 8 years of age, with the peak incidence between 10 and 13 years. Burmese cats have a recognised genetic predisposition and are diagnosed at significantly higher rates than other breeds.

The symptoms of diabetes in cats can develop gradually, making them easy to miss in the early stages. Being alert to subtle changes in your cat's behaviour and habits can lead to earlier diagnosis and better outcomes.

Classic Signs

• Increased thirst (polydipsia): Your cat may drink noticeably more water than usual. You might find them drinking from taps, sinks, or other unusual water sources.
• Increased urination (polyuria): More water in means more urine out. You may notice the litter box is wetter and heavier than normal, or your cat may begin having accidents outside the box.
• Weight loss despite a good appetite: This combination is a hallmark of diabetes. Your cat may be eating well — or even more than usual — but steadily losing weight because cells cannot access glucose for energy.
• Poor coat condition: A diabetic cat's coat may become dull, dry, unkempt, or greasy. Cats that were previously meticulous groomers may stop grooming effectively.

The Plantigrade Stance: A Unique Feline Sign

One symptom that is unique to cats with diabetes is the plantigrade stance — walking flat on the hocks (the lower part of the back legs) rather than on the toes. This gives the cat a distinctive flat-footed, crouching gait. It is caused by diabetic neuropathy, a form of nerve damage resulting from prolonged high blood sugar. The good news is that with effective glucose control, diabetic neuropathy can often improve or even resolve completely over weeks to months.

When to Seek Urgent Care

If your cat shows signs of diabetic ketoacidosis — vomiting, refusal to eat, extreme lethargy, dehydration, or a sweet/acetone-like smell on the breath — this is a medical emergency. DKA requires immediate veterinary hospitalisation with intravenous fluids and insulin.

Diagnosing diabetes in cats presents a unique challenge that does not apply to the same degree in dogs: stress hyperglycaemia. Cats are notorious for becoming stressed during veterinary visits, and this stress triggers a surge of adrenaline and cortisol that can raise blood glucose levels significantly — sometimes well into the diabetic range — even in healthy cats.

Why a Single Blood Glucose Reading Isn't Enough

A single elevated blood glucose reading in a cat at the vet clinic cannot reliably distinguish between true diabetes and stress-induced hyperglycaemia. Stress glucose levels in cats can reach 300-400 mg/dL (16-22 mmol/L), which overlaps heavily with diabetic values. This means an anxious, non-diabetic cat could be misdiagnosed if blood glucose alone is used for confirmation.

Fructosamine: The Gold Standard

To overcome this challenge, veterinarians rely on fructosamine testing. Fructosamine measures glycated proteins in the blood and reflects the average glucose level over the previous 2-3 weeks. Unlike a spot glucose reading, fructosamine is not affected by short-term stress spikes. A high fructosamine level confirms that hyperglycaemia has been sustained — indicating true diabetes rather than a momentary stress response.

Supporting Tests

Your vet will also perform a urinalysis to check for glucose and ketones in the urine. Persistent glucosuria (glucose in the urine) strongly supports a diabetes diagnosis. Additional blood work, including a full biochemistry panel and thyroid levels, is recommended to rule out conditions that can mimic or complicate diabetes — particularly hyperthyroidism, which is extremely common in older cats and can coexist with diabetes.

An accurate diagnosis is the foundation of effective treatment, so if there is any doubt, your vet may recommend retesting fructosamine after 2-3 weeks or conducting at-home glucose monitoring to confirm.

The cornerstones of feline diabetes treatment are insulin therapy and dietary modification. When started early and managed effectively, these two interventions offer the best chance of good glucose control — and even remission.

Insulin Therapy

Most diabetic cats require twice-daily insulin injections, given subcutaneously (under the skin). The most commonly recommended insulins for cats are ProZinc (protamine zinc insulin) and glargine (Lantus), both of which have been shown to provide smoother, longer-lasting glucose control in cats compared to older insulin formulations. Your vet will start with a conservative dose and adjust based on glucose curves and clinical response over the following weeks.

Injections are given using very fine needles and are usually well tolerated by cats — many owners report that their cats barely notice the injection. Giving insulin at the same time each day, approximately 12 hours apart, alongside a meal, is the ideal routine.

Dietary Change

Switching to a high-protein, low-carbohydrate diet is one of the most impactful changes you can make for a diabetic cat. This aligns with a cat's natural dietary needs as an obligate carnivore and has been shown to significantly improve glycaemic control. Wet (canned) food is generally preferred over dry kibble because it is naturally lower in carbohydrates and higher in moisture.

Many veterinary nutritionists recommend aiming for a diet with less than 10% of calories from carbohydrates. Prescription diabetic diets are available, but some high-quality commercial wet foods also meet this threshold — ask your vet for specific recommendations.

Why Early, Aggressive Treatment Matters

Research consistently shows that cats treated early and aggressively — with appropriate insulin and a low-carb diet from the start — have the highest rates of remission. Delaying treatment or under-dosing insulin allows glucose toxicity to continue damaging beta cells, reducing the chance of recovery.

One of the most remarkable aspects of feline diabetes is the possibility of diabetic remission — a period during which a cat no longer requires insulin injections and maintains normal blood glucose levels on diet alone. This is something that almost never happens in diabetic dogs, making it a unique and hopeful aspect of managing feline diabetes.

How Common Is Remission?

Studies suggest that 30-60% of diabetic cats can achieve remission, particularly those who are diagnosed early, started on insulin promptly, and transitioned to a low-carbohydrate diet. Cats that achieve good glycaemic control within the first 6 months of treatment have the highest remission rates. Obese cats that successfully lose weight also have a significantly better prognosis.

What Remission Looks Like

During remission, your cat's insulin dose will be gradually reduced under veterinary supervision as glucose levels normalise. Eventually, insulin may be discontinued entirely. Your cat will need to remain on a low-carbohydrate diet, and you should continue to monitor for signs of relapse — including increased thirst, urination, or weight changes.

Monitoring for Relapse

Remission does not always mean cure. Approximately 25-30% of cats in remission will relapse and require insulin again, sometimes months or even years later. Regular veterinary check-ups and periodic fructosamine testing are essential to catch any recurrence early. Maintaining a healthy weight and low-carb diet are the best ways to sustain remission long-term.

If your cat has been diagnosed with diabetes, don't lose hope. With committed management and close veterinary partnership, many cats go on to live comfortably — and a significant number may ultimately no longer need insulin at all. Keep a close eye on your cat's daily habits, attend scheduled check-ups, and celebrate the small victories along the way.