CONDITION
Hepatic Lipidosis
Hepatic lipidosis describes a state in which fat accumulates inside liver cells to the point where the liver struggles to function normally. It develops most commonly in cats, typically after a period of not eating — sometimes only a few days — and often follows a stressful event, illness, or abrupt change in routine. The underlying trigger may be obvious or subtle. Owners often notice their cat has stopped eating, appears lethargic, and may begin to show a yellow tinge to the skin, gums, or whites of the eyes. Weight loss tends to be noticeable, though the cat may have been overweight beforehand. Vomiting or excessive drooling can occur, and some cats seem uncomfortable or reluctant to move. This page explores the signals that can appear, what is happening inside the liver and why fat builds up in this way, how the condition is investigated through blood tests and imaging, and the range of approaches used to support recovery. The focus throughout is on helping you understand the shape of the condition and the decisions that may follow.
Why this matters now
Hepatic lipidosis occurs almost exclusively in cats, and can develop at any age, though middle-aged and overweight cats appear more susceptible. The pattern often begins after a period of reduced food intake lasting several days, which may follow a stressful event, a change in household routine, the introduction of a new diet, or an underlying illness that suppresses appetite. In some cases, no clear trigger is identified, and the loss of appetite itself becomes the presenting concern.
The accumulation of fat within liver cells typically develops over a period of days to a few weeks once food intake has fallen below the cat's energy needs. Early changes may be subtle, with quiet behaviour and partial appetite loss, but the process can accelerate if eating remains poor. Individual variation is considerable: some cats show marked signs within a week, while others may tolerate reduced intake for longer before the liver becomes visibly compromised. Without intervention to restore nutrition, the condition tends to worsen as liver function continues to decline.
Signals & patterns
Early signals
Reduced interest in food
The cat may approach the bowl but eat only small amounts, or turn away from food that was previously appealing. This change can be gradual or quite sudden, and may initially be mistaken for fussiness or a preference shift.
Quieter than usual
Many cats become less active and spend more time resting in secluded spots. The change in energy level may be subtle at first, noticed more in hindsight once other signs appear.
Weight loss
Loss of body condition may become visible over days to weeks, particularly in cats who were overweight to begin with. The abdomen may look smaller, and muscle over the spine and hips may feel less prominent.
Occasional vomiting
Some cats vomit small amounts of fluid or bile, often in the morning or after attempting to eat. The vomiting may be intermittent and can contribute further to the reluctance to eat.
Later signals
Yellow tinge to skin or eyes
A yellowish colour may become visible in the whites of the eyes, inside the ears, or on the gums. This change, known as jaundice, reflects a build-up of bilirubin as liver function declines.
Marked lethargy or weakness
The cat may become reluctant to move, show little interest in surroundings, or lie in unusual postures. Interaction with people or other animals often decreases noticeably.
Drooling or lip-smacking
Some cats develop ptyalism or repetitive mouth movements, which may be linked to nausea or changes in saliva composition. This sign can be distressing for owners to observe.
Changes in behaviour or mentation
In more advanced cases, cats may appear disoriented, less responsive, or show altered sleep-wake patterns. These signs can reflect the accumulation of metabolic byproducts that affect brain function.
Click to read about the biological mechanisms
How this is usually investigated
Investigation typically begins with a detailed history, particularly the duration and circumstances surrounding any period of reduced eating, and any concurrent stressors or illness. Physical examination may reveal jaundice, weight loss, an enlarged liver, and sometimes muscle wasting. Blood tests and imaging are then used to assess liver function, rule out other causes of liver disease, and evaluate the degree of fat accumulation.
Physical examination
Chemistry panel
Complete blood count
Abdominal ultrasound
Cytology
Options & trade-offs
Management centres on reversing the fat accumulation by restoring adequate caloric and protein intake, addressing any underlying condition that triggered the loss of appetite, and supporting liver function during recovery. The combination of approaches varies depending on the severity of illness, the cat's tolerance of different feeding methods, and the practicalities of home care. Different cats and households find different strategies workable.
Nutritional support via feeding tube
A tube placed into the oesophagus or stomach allows delivery of liquid nutrition in measured amounts throughout the day, bypassing the need for voluntary eating while the liver recovers. Tubes can remain in place for weeks and are typically managed at home once the technique is learned. Nutritional plans are tailored to provide sufficient calories and protein without overloading the recovering liver.
Trade-offs: Tube placement requires sedation or anaesthesia, which carries risk in unwell cats, and some owners find the prospect of managing a feeding tube at home daunting. The approach allows precise control of intake but does not address the cat's underlying reluctance to eat, and weaning back to voluntary feeding can take time.
Appetite stimulants and assisted feeding
Medications that stimulate appetite, such as mirtazapine or capromorelin, may encourage voluntary eating in cats with milder cases or during recovery. Syringe feeding or hand feeding small amounts of palatable food can supplement intake when a cat is willing to accept it but not eating independently.
Trade-offs: Appetite stimulants are less reliable in severely affected cats and cannot guarantee adequate caloric intake. Forced feeding can be stressful for both cat and owner, and if intake remains insufficient, the liver continues to accumulate fat rather than mobilising it.
Intravenous fluid therapy and electrolyte correction
Cats with hepatic lipidosis are often dehydrated and may have disturbances in potassium, phosphate, or other electrolytes. Intravenous fluids restore hydration and allow correction of imbalances, supporting overall metabolic stability during the early phase of treatment.
Trade-offs: Fluid therapy requires hospitalisation or repeated visits and does not address the core problem of caloric deficit. It is a supportive measure rather than a standalone treatment, and over-aggressive fluid administration can worsen complications in some cases.
Treatment of underlying or concurrent conditions
Identifying and managing the illness or stressor that initially caused the cat to stop eating is an essential part of recovery. This may involve antibiotics for infection, analgesia for pain, anti-nausea medication, or addressing environmental stressors. The liver can begin to recover once the trigger is removed and nutrition is restored.
Trade-offs: The underlying cause is not always apparent, and in some cases multiple factors may have contributed. Diagnostic investigation adds cost and time, and treatment of concurrent disease does not alone reverse hepatic lipidosis without nutritional intervention.
Gradual reintroduction of normal diet
As liver function improves and the cat begins to show interest in food, the transition from tube feeding or liquid nutrition to a normal diet occurs in stages. Palatable, energy-dense foods are offered in small amounts, and intake is monitored to ensure the cat continues to meet its caloric needs.
Trade-offs: Some cats remain reluctant to eat voluntarily even after clinical improvement, and premature removal of feeding support can lead to relapse. The weaning process may take weeks, and appetite can fluctuate unpredictably during recovery.
Common misconceptions
"Hepatic lipidosis only affects obese cats."
Overweight and obese cats are at higher risk, but any cat that stops eating for a sufficient period can develop hepatic lipidosis. Lean cats can be affected, particularly if they experience prolonged anorexia due to illness or stress. Body condition influences susceptibility but does not determine whether the condition will occur.
"Once a cat starts eating again, the liver will recover on its own without further intervention."
Resuming eating is essential, but recovery depends on sustained, adequate caloric and protein intake over weeks to months, along with management of any underlying illness. Intermittent or insufficient eating does not reverse the fat accumulation and may allow the condition to worsen. Structured nutritional support is typically required.
"Hepatic lipidosis is a primary liver disease caused by a defect in the liver itself."
Hepatic lipidosis is a metabolic response to prolonged anorexia, not a primary liver disorder. The liver is structurally normal before the episode of reduced eating begins. Fat accumulation occurs because the body mobilises fat faster than the liver can process it, and the condition is reversible when nutrition is restored and the trigger is addressed.
Related conditions
Acute Pancreatitis
Acute pancreatitis can occur alongside hepatic lipidosis in cats, and the two conditions may share overlapping signs such as vomiting, loss of appetite, and lethargy. In some cases, inflammation in the pancreas and fat accumulation in the liver develop concurrently, particularly when a period of poor eating has preceded both.
Cholangiohepatitis in Cats
Cholangiohepatitis and hepatic lipidosis can occur together in cats, particularly when inflammation of the bile ducts disrupts normal liver function and contributes to reduced appetite. The two conditions may present with similar signs, including jaundice and weight loss, and distinguishing between them often requires imaging and sampling of liver tissue.
Feline Leukaemia Virus (FeLV)
Feline leukaemia virus infection can predispose cats to hepatic lipidosis, as the virus may cause reduced appetite or concurrent illness that triggers fat mobilisation. Cats with FeLV may also develop other complications affecting the liver, making the clinical picture more complex.
Diabetic Ketoacidosis
Diabetic ketoacidosis and hepatic lipidosis both involve metabolic derangement in which the body shifts to breaking down fat for energy, though the triggers and consequences differ. In cats with diabetes, prolonged poor glucose control and reduced eating can lead to both ketone production and fat accumulation in the liver, sometimes overlapping in the same individual.
Anal Gland Disease
Alimentary lymphoma in cats can cause prolonged loss of appetite and weight loss, which in turn may trigger hepatic lipidosis as fat stores are mobilised faster than the liver can process them. The two conditions may present with overlapping signs such as vomiting and lethargy, and distinguishing them requires investigation of the gastrointestinal tract and liver function.
Understanding the pattern of hepatic lipidosis can inform how appetite changes in cats are approached more broadly, particularly in cats with a tendency toward weight gain or those prone to stress-related inappetence. The metabolic health pillar explores other conditions in which energy balance and organ function intersect. For cats recovering from hepatic lipidosis, conversations around weight management, environmental enrichment, and strategies for maintaining consistent eating during periods of illness or change may be useful in the longer term.
Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS