Introduction
As more cats live longer, indoor lives, many are becoming less active and more prone to weight gain. This shift toward a sedentary lifestyle—combined with calorie-dense or high-carbohydrate diets—has contributed to rising rates of feline obesity, a leading risk factor for diabetes¹.
In fact, recent studies estimate that feline diabetes now affects between 0.2% and 1.2% of cats in parts of Asia, with rates increasing in urban environments². Also called a “silent disease,” feline diabetes is often detected at advanced stages due to subtle symptoms, but may lead to serious complications or even premature death, if left ignored and untreated.
What Is Feline Diabetes?
Feline diabetes is a chronic condition in which a cat’s body either does not produce enough insulin or cannot use it effectively. Insulin is a hormone produced by the pancreas that regulates blood sugar by moving glucose from the bloodstream into the body’s cells, where it is used for energy³.
Like in humans, most cases (over 80%) resemble Type 2 diabetes and are driven by insulin resistance⁴, often linked to obesity. As a result, glucose builds up in the bloodstream, leading to high blood sugar (hyperglycaemia).
Over time, persistently high blood sugar can damage blood vessels and impair cellular function, disrupting the delivery of oxygen and nutrients to tissues. This can affect vital organs such as the kidneys and liver, while also weakening the immune and nervous systems.
Key Risk Factors of Feline Diabetes
While any cat can develop diabetes, certain factors increase the risk⁵:
• Obesity: Overweight cats are up to four times more likely to develop diabetes, as excess fat reduces insulin sensitivity⁶
• Physical Inactivity: A lack of exercise contributes to weight gain and worsens insulin resistance
• Age and Gender: More common in neutered males and cats over seven years old due to hormonal changes and reduced insulin function⁷
• Medications: Long-term use of corticosteroids may force the liver to release more glucose and reduce insulin sensitivity⁸
• Diet: Frequent consumption of high-carbohydrate diets may lead to repeated blood sugar spikes
The "Silent Disease": Why Early Detection Matters
Feline diabetes is often referred to as a “silent disease” because cats instinctively hide signs of illness. In the wild, showing weakness makes them vulnerable to predators, so this behaviour has evolved as a survival mechanism. As a result, by the time a cat appears visibly unwell, the disease is often already advanced.
Early detection is therefore critical, as timely intervention can significantly improve outcomes and quality of life. Cat owners should watch for early signs such as⁹:
• Increased Thirst (Polydipsia): Refilling the water bowl more frequently than usual.
• Increased Urination (Polyuria): Larger or heavier clumps in the litter box.
• Weight Loss: Dropping weight despite a ravenous appetite (Polyphagia).
• Lethargy: Less interest in play or difficulty jumping onto high surfaces.
Unfortunately, if left untreated, feline diabetes can progress to serious complications. In fact, when the body cannot use glucose effectively, it begins breaking down fat and muscle for energy, leading to:
• Diabetic Ketoacidosis (DKA): A life-threatening condition where fat breakdown produces the buildup of acidic ketones in the blood, leading to vomiting, dehydration, and severe weakness¹⁰
• Diabetic Neuropathy: Diabetes leads to nerve damage, especially in the hind limbs, resulting in a flat-footed gait¹¹
• Secondary Infections: High glucose levels promote bacterial growth, increasing the risk of urinary tract and skin infections¹²
• Organ Damage: Chronic high blood sugar can impair kidney and liver function over time¹³
Treatment Options
Fortunately, feline diabetes is often manageable—and in some cases, reversible—when diagnosed early and treated appropriately.
1. Conservative Management: For overweight or early-stage cases, lifestyle changes are the first step. A calorie-controlled, high-protein, low-carbohydrate diet combined with regular exercise can promote weight loss, improve insulin sensitivity, and may even lead to remission¹⁴
2. Insulin Injections: If lifestyle changes are insufficient, veterinarians may prescribe insulin therapy to help regulate blood glucose¹⁵. This typically involves twice-daily injections under the skin, along with strict dosing schedules and monitoring, which can be challenging for some owners.
3. Oral Medications: For non–insulin-dependent cats, newer options such as Senvelgo® are available. This once-daily liquid medication prevents the kidneys from reabsorbing glucose, allowing excess sugar to be excreted through urine. Clinical studies show it can effectively improves blood sugar control in newly diagnosed cats, with some achieving remission¹⁶.
Preventing Feline Diabetes at Home
As with any chronic condition, prevention is always better than cure. If your cat may be at risk, consider the following¹⁷:
• Weight Monitoring: Use a Body Condition Score (BCS) chart to assess your cat’s shape. A healthy cat should have a visible waist and ribs that can be felt but not seen
• Active Lifestyle: Engage your cat in at least 10–15 minutes of interactive play daily to maintain a healthy weight and improve insulin sensitivity
• High-protein Feeding: Prioritise wet foods that are high in protein and low in carbohydrates to reduce excess calorie intake and blood sugar spikes
• Routine Screenings: Senior cats (aged 7+) should undergo annual veterinary check-ups, including blood tests, to detect early changes in glucose levels.
Refs:
1. https://pubmed.ncbi.nlm.nih.gov/29140289/
2. https://www.mdpi.com/2306-7381/12/6/529
3. https://joe.bioscientifica.com/view/journals/joe/222/3/T1.xml
4. https://www.dovepress.com/managing-feline-diabetes-current-perspectives-peer-reviewed-fulltext-article-VMRR
5. https://pubmed.ncbi.nlm.nih.gov/19034421/
6. https://journals.sagepub.com/doi/10.1177/1098612X211021540
7. https://academic.oup.com/jvim/article/30/4/964/8452839?login=false
8. https://www.dovepress.com/managing-feline-diabetes-current-perspectives-peer-reviewed-fulltext-article-VMRR
9. https://pmc.ncbi.nlm.nih.gov/articles/PMC11148891/
10. https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feline-diabetes
11. https://academic.oup.com/jnen/article-abstract/61/10/872/2916290?redirectedFrom=fulltext
12. https://www.aaha.org/wp-content/uploads/globalassets/02-guidelines/diabetes/2018-aaha-diabetes-management-guidelines-2022-update.pdf
13. https://www.aaha.org/wp-content/uploads/globalassets/02-guidelines/diabetes/2018-aaha-diabetes-management-guidelines-2022-update.pdf
14. https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4952919
15. https://veterinarypartner.vin.com/doc/?id=4951390
16. https://www.aaha.org/wp-content/uploads/globalassets/02-guidelines/diabetes/sponsorresources/senvelgo-vet-detailer.pdf
17. https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feline-diabetes