Fatty Liver Disease

Fatty liver disease is a condition in which fat builds up inside the cells of the liver. A small amount of fat in the liver is normal, but when fat makes up a larger proportion it can affect how the liver works over time.

The most common type is not caused by alcohol and is strongly linked to weight, blood sugar, and other aspects of metabolism. It is often described using terms such as non-alcoholic fatty liver disease or, more recently, metabolic dysfunction-associated steatotic liver disease.

Fatty liver disease describes fat accumulation in the liver and is usually an early, often reversible problem. Cirrhosis is advanced, permanent scarring of the liver that can develop after long-term damage from various causes, including untreated fatty liver disease in some people. They are different stages, not the same thing.

Hepatitis means inflammation of the liver and has many causes, including certain viruses, alcohol, and fatty liver disease itself. Having fatty liver disease does not mean you have viral hepatitis; they are separate conditions even though both affect the liver.

In its early stages fatty liver disease usually causes no symptoms, which is why it is often found by chance during tests done for another reason. Some people experience tiredness, a general feeling of being unwell, or a dull discomfort in the upper right side of the abdomen.

More noticeable symptoms tend to appear only if the disease has progressed to significant scarring. Because early disease is silent, awareness of the risk factors is important.

The common form is closely associated with carrying excess weight, particularly around the abdomen, having type 2 diabetes or insulin resistance, high blood pressure, and raised cholesterol or other blood fats. Being physically inactive also contributes.

Risk increases with age, and conditions such as polycystic ovary syndrome are also linked. The disease can be present even in people who are not overweight, so anyone with metabolic risk factors may be affected.

Fatty liver disease is often first suspected after blood tests show changes in liver markers, or when an ultrasound or other scan shows fat in the liver. A doctor will ask about your health, alcohol intake, and risk factors to help work out the likely cause.

To assess how much scarring (fibrosis) is present, doctors may use blood-test based scores or specialised scans that measure liver stiffness. In some cases a liver biopsy, where a small sample is taken, is used to give more detailed information.

There is no single medicine that cures the common form of fatty liver disease, so management focuses on the underlying causes. Gradual weight loss where appropriate, regular physical activity, a balanced diet, and good control of blood sugar, blood pressure, and cholesterol can reduce fat in the liver and lower the risk of progression.

Limiting alcohol and not smoking are also advised. People with more advanced disease may be looked after by a liver specialist, and treatments for related conditions such as diabetes are an important part of care. In severe cirrhosis, specialist assessment, including consideration of transplantation, may be needed.

The same healthy habits that treat fatty liver disease also help prevent it: maintaining a healthy weight, staying active, eating a balanced diet, and keeping blood sugar, blood pressure, and cholesterol in a healthy range. Drinking within recommended limits supports liver health.

For many people the outlook is good, especially when the condition is caught early and lifestyle changes are made. Most remain at the simple fatty liver stage. A smaller number progress to inflammation and scarring, so regular review with a doctor is helpful for those at higher risk.