Cat Fatty Liver Disease (Hepatic Lipidosis): Causes, Signs, and Treatment

Feline hepatic lipidosis, commonly called “fatty liver disease,” is one of the most common and serious liver conditions in cats. It develops when a cat stops eating for even a few days, causing the body to mobilize fat into the liver faster than it can process it. Left untreated, it can be fatal — but with prompt veterinary care, most cats recover fully.

This guide is for informational purposes. Always contact a licensed veterinarian for diagnosis and treatment of your pet’s health concerns.

What Is Hepatic Lipidosis?

Hepatic lipidosis occurs when excess fat accumulates inside liver cells, impairing the liver’s ability to function. It is unique to cats among common companion animals because of how feline metabolism handles fasting: when a cat isn’t eating, its body rapidly breaks down fat stores for energy and sends them to the liver for processing. In cats, this process can overwhelm the liver within just a few days of reduced food intake, unlike dogs or humans, who tolerate short fasts far better.

This makes hepatic lipidosis one of the most common liver diseases seen in cats — and one of the few where the trigger is often something as seemingly minor as a few days of poor appetite.

Causes and Risk Factors

Hepatic lipidosis is almost always secondary to another underlying problem that causes the cat to stop or significantly reduce eating. Common triggers include:

• Stress-related appetite loss: Moving homes, a new pet, or boarding can trigger a cat to stop eating.
• Underlying illness: Conditions like kidney disease, pancreatitis, diabetes, cancer, or dental pain often cause reduced appetite that can progress to hepatic lipidosis if untreated.
• Obesity: Overweight cats are at significantly higher risk, since they have more fat reserves to mobilize when they stop eating.
• Sudden diet changes: Cats can be notoriously picky, and an abrupt food switch that a cat refuses to eat can be enough to trigger the condition.
• Anorexia from any cause: Essentially any illness, injury, or stressor that causes a cat to go 2–3 days without adequate food intake raises risk.

Signs and Symptoms

Because hepatic lipidosis develops secondary to appetite loss, the earliest sign is often simply a cat not eating — which owners should never dismiss as “just being picky” for more than a day or two.

Jaundice — a yellow tint visible in the gums, inner ears, or whites of the eyes — is one of the hallmark signs of advanced liver dysfunction and requires immediate veterinary attention.

Diagnosis and Treatment

Vets typically diagnose hepatic lipidosis through a combination of bloodwork (showing elevated liver enzymes and bilirubin), abdominal ultrasound, and sometimes a fine-needle aspirate or biopsy of the liver to confirm fat accumulation in liver cells.

The cornerstone of treatment is aggressive nutritional support — getting calories into the cat as quickly and consistently as possible, since the liver cannot begin to recover until fat mobilization stops. This often involves:

• Feeding tube placement: Most cats with hepatic lipidosis need a temporary feeding tube (esophagostomy or nasogastric) because they won’t eat enough voluntarily to reverse the condition.
• Fluid therapy: To correct dehydration and electrolyte imbalances, which are common in affected cats.
• Treating the underlying cause: Addressing whatever triggered the initial appetite loss — whether pancreatitis, dental disease, or another condition.
• Appetite stimulants: Sometimes used alongside tube feeding, though they are rarely sufficient alone in established cases.

Recovery typically takes several weeks of consistent nutritional support, and most cats make a full recovery when the condition is caught and treated promptly. If your cat hasn’t eaten in more than 24–48 hours, contact your local veterinarian right away rather than waiting to see if appetite returns on its own.

Prevention and Outlook

Because hepatic lipidosis is triggered by appetite loss, prevention centers on never letting a cat go without food for more than a day or two:

• Treat any illness causing appetite loss promptly, rather than waiting to see if it resolves on its own
• Introduce new foods gradually rather than switching abruptly
• Monitor overweight cats closely during any diet change or illness, since they’re at highest risk
• Reduce stress during transitions like moving, boarding, or introducing new pets
• Schedule a vet visit if a cat refuses food for more than 24 hours, especially if overweight or already diagnosed with another condition

With early intervention, the prognosis for hepatic lipidosis is good — most cats fully recover. Without treatment, however, the condition carries a high mortality rate, which is why prompt veterinary care is essential.

If your cat has stopped eating, don’t wait it out — HeiBob’s local veterinarian directory can help you find urgent care nearby.