A Cat That Stops Eating Is Never "Just Being Fussy"
A cat that refuses food for 48 to 72 hours is not simply being particular. In felines, prolonged anorexia can trigger a potentially fatal cascade in the liver — hepatic lipidosis, also known as fatty liver syndrome. It is the most common liver disease in cats and can develop with alarming speed, particularly in overweight individuals. Understanding why it happens and how to respond is knowledge every cat owner should have.
The Unique Feline Metabolism Behind the Risk
Cats are obligate carnivores with a metabolic system designed for frequent, protein-rich meals. Unlike dogs or humans, cats have a limited ability to regulate fat mobilisation during fasting. When a cat stops eating, the body mobilises fat reserves from adipose tissue at a rapid rate to use as energy. In cats with excess body fat — a large proportion of the domestic cat population — this mobilisation overwhelms the liver's capacity to process fatty acids.
The result: fat accumulates within liver cells (hepatocytes), impairing their function and causing progressive liver failure. Obese cats face the highest risk, but any cat can develop hepatic lipidosis if anorexia persists long enough.
Common Triggers for Anorexia in Cats
Hepatic lipidosis is always secondary to something that caused the cat to stop eating in the first place. Identifying and treating the underlying cause is essential — managing the lipidosis alone is not sufficient.
- Stress: moving house, a new pet, or changes in routine
- Concurrent illness: upper respiratory infections, pancreatitis, inflammatory bowel disease
- Pain: dental disease, arthritis, or post-surgical discomfort
- Dietary changes: switching food abruptly can cause food aversion
- Obesity combined with any appetite-reducing factor
Recognising the Signs
The early signs of hepatic lipidosis can be deceptively nonspecific. By the time jaundice appears, liver damage is already substantial.
Early Signs
- Reduced appetite progressing to complete food refusal
- Weight loss over days to weeks
- Lethargy and withdrawal from normal activities
- Muscle wasting, particularly over the head and spine
Later Signs
- Jaundice — yellowing of the skin, gums, and whites of the eyes
- Vomiting and drooling
- Neurological signs including disorientation or seizures in severe cases
- Collapse
The rule of thumb: if your cat has not eaten voluntarily for more than 48 hours, contact your vet. Do not wait for jaundice.
Diagnosis and Hospitalisation
Blood work typically reveals elevated liver enzymes (particularly ALT and ALP), hyperbilirubinaemia, and sometimes low potassium or phosphorus. Ultrasound of the liver shows characteristic hyperechogenicity (the liver appears abnormally bright due to fat infiltration). A liver aspirate or biopsy can confirm the diagnosis, though treatment is often initiated on clinical grounds in critical patients.
Treatment: Nutritional Support Is the Cure
The cornerstone of treatment is aggressive nutritional support. The liver needs a steady supply of protein and calories to reverse fat accumulation — and cats with hepatic lipidosis will rarely eat voluntarily. Most require assisted feeding via a feeding tube, placed either through the nose (nasogastric), oesophagus (oesophagostomy), or stomach (gastrostomy). Oesophagostomy tubes are commonly preferred for home management as owners can feed through them with relative ease.
Feeding small, frequent meals of a high-protein feline-appropriate diet is essential. Carbohydrate-heavy feeds are counterproductive. Supplementation with B vitamins, particularly thiamine, and sometimes L-carnitine (to support fat metabolism) is often included. Potassium and phosphorus must be monitored and supplemented as needed, since refeeding syndrome — a drop in electrolytes when nutrition restarts — is a real risk.
With early, aggressive intervention, survival rates exceed 80 per cent. Without treatment, hepatic lipidosis is fatal. Recovery typically requires several weeks of tube feeding, but most cats regain normal liver function entirely. Never attempt to force-feed a reluctant cat at home without veterinary guidance — aspiration pneumonia is a serious risk. If your cat has stopped eating, this is a veterinary emergency.