Fatty liver disease

Also called steatohepatitis or steatosis.

Key points about fatty liver disease

  • Fatty liver disease is a build-up of fat in the liver.
  • There are 2 types of fatty liver disease – alcohol-related fatty liver disease and non-alcoholic or metabolic associated fatty liver disease (MAFLD).
  • MAFLD used to be called non-alcoholic fatty liver disease or NAFLD.
  • In the early stages of fatty liver disease most people have no symptoms, and it doesn’t cause serious problems for them. In some cases, though, it can lead to liver damage. 
  • he good news is, if it's detected and managed early, you can often prevent or even reverse fatty liver disease with lifestyle changes.
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  • Fatty liver disease is the build-up of too much fat in the liver.
  • There are 2 types of fatty liver disease – alcohol-related fatty liver disease and non-alcohol related, or metabolic associated fatty liver disease (MAFLD).
  • There's an increasing number of people with fatty liver disease that's not caused by alcohol (MAFLD).
  • Most fatty liver disease is preventable.
  • If detected and managed at an early stage, liver disease can be slowed and even reversed.
  • Treatment includes weight loss (if overweight), getting good control of diabetes, blood pressure and blood fats (cholesterol and triglycerides), regular physical activity, avoiding alcohol and stopping smoking.
  • Let your healthcare provider know if you are taking any medicines (including herbal medicines and supplements) or other drugs. These may be harmful to your liver. Your healthcare provider can advise about reducing or stopping them if needed.

Your liver has a role in digesting foods and ridding your body of toxic substances. It's healthy to have some fat in your liver, but if the fat builds up it can cause fatty liver disease. Having too much fat in your liver can interrupt the filtering process. While your liver can repair itself when it's mildly damaged, severe damage can progress to cirrhosis of the liver. This can lead to liver cancer and liver failure. People with fatty liver disease are also at increased risk of heart problems, kidney disease and strokes. Read more about liver disease.

Image credit: 123rf

Fatty liver disease isn't caused just by eating fatty foods. It's usually due to a combination of things happening in your body over a long period of time. 

Alcohol-related fatty liver disease

Excess alcohol is the main cause of alcohol-related fatty liver disease. Fatty liver develops in 46–90% of people who drink a lot of alcohol. For some people, 5–10 standard drinks per week may be enough to cause fatty liver disease. Read more about alcohol and how much a standard drink is.

Metabolic associated fatty liver disease (MAFLD) 

MAFLD used to be called non-alcoholic fatty liver disease or NAFLD. Some people get fatty liver disease without having any pre-existing conditions. However these risk factors make you more likely to develop it: 

Use this screening test(external link) to see if you are at risk of fatty liver disease. 

Video: The stages of NAFLD (non-alcohol related fatty liver disease)

Watch a video about the stages of MAFLD. This video may take a few moments to load.

(British Liver Trust, UK, 2022)

In the early stages of fatty liver disease you may have no symptoms. Some people get symptoms such as: 

  • feeling weak and tired all the time
  • weight loss 
  • a pain or discomfort in the upper right part of your stomach
  • nausea
  • swelling in the liver region
  • poor appetite. 

If you have ongoing symptoms and concerns talk to your doctor about them. 

If fatty liver disease progresses to cirrhosis, more severe symptoms can develop. These include yellowing of the skin and whites of the eyes (jaundice), abdominal swelling and an enlarged spleen. 


It can be hard to diagnose fatty liver disease, especially when the disease is still in its early stages. Your healthcare provider may suspect it after examining your symptoms and medical history. 

Diagnosis is usually confirmed through:


There is no specific treatment for fatty liver disease, although other associated conditions (eg, diabetes, high blood pressure and high cholesterol) may be treated with medication.

Lifestyle changes are the best way of managing fatty liver disease in order to reduce the progression and even reverse liver damage. These include:

  • cutting down or stopping drinking alcohol
  • regular exercise 
  • treating other liver conditions such as hepatitis C or B
  • stopping smoking
  • getting your blood pressure levels under control
  • managing your cholesterol level
  • having a healthy weight
  • eating a balanced and healthy diet and reducing fat and sugar intake
  • avoiding starvation, excess dieting and protein malnutrition
  • blood glucose control.

Let your healthcare provider know if you are taking any medications (including herbal medications and supplements) or other drugs. These may be harmful to your liver. Your healthcare provider can advise about reducing or stopping them if needed.

The following links provide more information about fatty liver disease. Be aware that websites from other countries may contain information that differs from New Zealand recommendations.

Information about Fatty Liver Disease(external link) Gastroenterological Society of Australia
Non-alcoholic fatty liver disease(external link) Patient Info, UK
What is fatty liver disease?(external link) The Hepatitis Foundation of New Zealand
Non-alcoholic fatty liver disease(external link) NHS, UK


  1. Nonalcoholic fatty liver disease(external link) Mayo Clinic, US
  2. NAFLD, NASH and fatty liver disease(external link) British Liver Trust, UK, 2022
  3. Steatohepatitis and steatosis (fatty liver)(external link) Patient Info, UK

NAFLD (Non-alcoholic Fatty Liver) fibrosis score(external link) MDCalc
Non-alcoholic fatty liver disease and non-alcoholic steatohepatitis(external link) (requires registration and log-in) BMJ Learning, UK
Coppell K, Schultz M, McCormick S, Sharp K. Non-alcoholic fatty liver disease (NAFLD) – dietary triggers and treatment approaches(external link) Edgar Diabetes and Obesity Research, University of Otago, NZ

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Credits: Healthify editorial team. Healthify is brought to you by Health Navigator Charitable Trust.

Reviewed by: Associate Professor Sue Wells, Public Health Physician, University of Auckland

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