Liver Fatty Liver Disease

Overview

Fatty liver disease means that fat has built up inside your liver cells. A healthy liver contains a little fat, but when fat makes up more than about 5 in 100 of the liver's weight, doctors call it fatty liver disease (also called steatotic liver disease). Your liver is a large organ in the upper right part of your belly. It cleans your blood, stores energy, and helps digest food. Extra fat can make the liver swell and, over many years, can cause scarring. There are two main types. One is linked to drinking a lot of alcohol. The other is linked to things like carrying extra weight, type 2 diabetes, and high cholesterol, and it can happen even in people who drink little or no alcohol. Both types are treated in similar ways, and in the early stages the liver can often heal.

Yes, it is very common. Around 1 in 4 adults worldwide are thought to have some form of fatty liver disease, and the numbers have been rising. It is one of the most common liver conditions doctors see.

It can affect anyone, including children. It is more common in people who carry extra weight around the middle, who have type 2 diabetes or high cholesterol, who drink a lot of alcohol, or who take certain medicines. It becomes more common with age and is often found in people in their 40s to 60s. Some people develop it without any of these risk factors, which can feel unfair but is not unusual.

Symptoms

Common symptoms

• No symptoms at all — this is the most common situation, especially in early stages
• Feeling tired or lacking energy
• A dull ache or discomfort in the upper right part of the belly
• Feeling full quickly or mild indigestion
• Losing weight without trying (less common)
• Yellowish skin or eyes, swelling of the belly or legs, or easy bruising — these only appear if the liver has been damaged for a long time and need medical checks

Symptoms in children

• Usually no symptoms at all
• Some children have a vague belly ache or feel tired
• Often picked up when a child has a blood test for another reason, or because of extra weight around the middle
• Dark patches of skin in the folds of the neck or armpits can be a sign of insulin resistance, which is linked to fatty liver

Symptoms in older adults

• Tiredness and low energy may be put down to age, so liver problems can be missed
• Mild confusion, poor concentration, or unusual sleepiness can occur if the liver is working poorly, and should be checked
• Swelling of the legs or belly, or getting out of breath easily
• Muscle loss and frailty can make the effects of liver disease feel stronger

Causes

Main causes

• A build-up of fat in the liver, usually linked to the body not responding well to insulin (insulin resistance). This type is not caused by alcohol.
• Drinking a lot of alcohol over many years. Alcohol is broken down by the liver, and the process can lead to fat storage and damage.
• Carrying extra weight, especially around the waist, and having type 2 diabetes or high levels of fat in the blood.
• Some medicines, such as long-term steroids or certain treatments for other conditions — ask your doctor or pharmacist whether any medicine you take could affect your liver.
• Rapid weight loss, poor nutrition, or eating very little for a long time can also lead to fat in the liver.
• Other liver conditions, such as hepatitis B or C, can cause fat in the liver as part of the illness.

Risk factors

• Being overweight or living with obesity, particularly extra weight around the middle
• Type 2 diabetes or prediabetes
• High cholesterol or high triglycerides (blood fats)
• High blood pressure
• Drinking more alcohol than the recommended limits
• A family history of fatty liver disease
• Taking certain medicines long term
• Polycystic ovary syndrome, an underactive thyroid, or poor sleep such as untreated sleep apnoea
• Getting older, and being post-menopausal

When to see a doctor

See a doctor urgently if:

• Your skin or the whites of your eyes turn yellow
• Your belly or legs swell up
• You notice blood in your vomit or stool, or your stools are black and tarry
• You feel confused, unusually sleepy, or shaky
• You have severe belly pain with a fever

Book a routine appointment if:

• A blood test has shown raised liver enzymes and you have not had this checked
• You feel tired all the time or have a nagging ache in your upper right belly
• You have type 2 diabetes, high cholesterol, or extra weight around the middle and want to know about liver health
• You drink alcohol regularly and would like advice on safer drinking
• You are thinking about a big change in diet or weight and want support

Diagnosis

Doctors usually start with your medical history and a physical check, then order blood tests. If your liver tests are raised, or you have risk factors, they may arrange a scan. Many people are diagnosed by chance during tests for something else. If early results suggest scarring, you may be referred to a liver specialist (a hepatologist or a gastroenterologist).

Tests that may be done

• Blood tests to check how your liver is working and whether it is inflamed
• A simple score calculated from your blood tests and age (often called a liver fibrosis score), used to estimate scarring
• An ultrasound scan of the liver, which is painless and shows fat and the shape of the liver
• A special ultrasound or MRI scan that measures how stiff or fatty the liver is (for example FibroScan or a liver stiffness scan) — this is quick and painless
• Blood tests for other causes, such as hepatitis B and C, and checks for other conditions
• A liver biopsy only in some cases — a small sample of liver taken with a fine needle to look at the tissue more closely

What to expect at your appointment

Most of the tests are simple and painless. You may have a few blood tests over weeks or months, and scans are usually quick and done as an outpatient. Results can take a little time. Try to bring a list of your medicines, and ask for a copy of your results so you can track changes. It is fine to ask what your results mean in plain words.

Treatment

There is no single pill that cures fatty liver disease. The main treatment is a steady change in daily habits, especially gradual weight loss and moving more, which can reduce the fat in the liver and even reverse early damage. Doctors also treat the things that make fatty liver worse, like diabetes, high blood pressure, and high cholesterol, and they support you to cut back on alcohol. A specialist may discuss specific medicines in certain situations — always ask them rather than starting anything yourself.

Self-care at home

• Aim for gradual, steady weight loss if you carry extra weight — losing around 5 to 10 out of every 100 of your body weight can make a big difference. Losing fast is not better and can make the liver worse.
• Cut back on or stop alcohol. Ask for help if this feels hard — there is support available and it is not something you have to do alone.
• Fill half your plate with vegetables and fruit, choose whole grains, beans, fish, lean meat or plant proteins, and cut down on sugary drinks and processed snacks.
• Move your body most days — walking, cycling, swimming, dancing, or anything you enjoy. Build up slowly.
• Keep up with your regular check-ups for blood pressure, blood sugar, and cholesterol.
• Check with your doctor or pharmacist before taking new medicines, supplements, or herbal products, as some can affect the liver.
• Try to protect your sleep and manage stress, and aim to keep your routine regular.
• Get vaccinated against hepatitis A and B if your doctor advises it.

Medical treatments

Treatment focuses on the whole person. Your doctor will help you manage blood sugar, blood pressure, and cholesterol, because these affect your liver too. They may refer you to a dietitian for a food plan you can stick to, and to a service that helps people reduce or stop drinking alcohol if that applies to you. In some countries, specific liver medicines are now approved for certain people with fatty liver and more advanced scarring — your specialist can tell you if any of these are right for you. Regular check-ups and scans help track how your liver is doing. Never start a new medicine or supplement for your liver without asking your healthcare team.

When is surgery considered?

Surgery is not needed for fatty liver disease itself. In rare cases, when the liver has been badly damaged and is failing, a liver transplant may be considered. Your specialist team would discuss this with you in detail. Weight-loss surgery may sometimes be discussed for people with severe obesity, as part of a wider plan.

Living with this condition

Most people with fatty liver disease live full, normal lives. You may have regular blood tests or scans, and small daily habits — like a short walk after meals or swapping sugary drinks for water — add up over time. Keep track of how you feel and share changes with your doctor. It helps to plan meals and shopping in advance, and to have easy healthy options at home.

Lifestyle tips

• Routine helps: regular meals, regular sleep, and regular movement
• Plan alcohol-free days and find a drink you enjoy instead
• Keep a simple food and activity diary if you find it useful, but avoid being too strict with yourself
• Build a support team — a friend, family member, or a group can keep you motivated
• Watch out for crash diets and detox products that promise to clean your liver
• Keep your appointments, and ask for copies of your results
• If you smoke, getting help to stop is good for your liver and your heart

Diet and exercise

Eat regular meals and try not to skip breakfast. Choose water or unsweetened drinks instead of sugary ones. Cook more at home where you can, and use the plate method: half vegetables and fruit, a quarter whole grains, and a quarter protein. Cut down on fried food, processed meats, and sweets — but you don't have to give them up completely, just have them less often. For movement, aim for at least 150 minutes a week of moderate activity like brisk walking, spread over several days, plus some strength exercise twice a week if you can. Any movement counts, and starting small is fine. If you have other health conditions, check with your doctor before a big change.

Mental health and emotional wellbeing

Being told you have a liver condition can bring worry, frustration, or even shame, especially if you have been trying hard with your weight. These feelings are common and understandable. Fatty liver disease is not a character flaw, and it is not your fault. If low mood, anxiety, or worry about your health is affecting your days, tell your doctor — talking therapy and other support can help a lot. If you ever feel you might harm yourself, please reach out right away: contact your local emergency number, or a crisis line or mental health service in your area, or tell someone you trust so they can stay with you.

Prevention

Much of the time, yes. The type of fatty liver linked to weight, blood sugar, and alcohol can often be prevented or improved by keeping to a healthy weight, eating well, moving regularly, and staying within the alcohol limits. If you already have some fat in your liver, the same steps can stop it getting worse.

Vaccines

There is no vaccine for fatty liver disease itself. However, your doctor may recommend vaccination against hepatitis A and hepatitis B, because these viruses can harm the liver. Ask your doctor or pharmacist which vaccines are right for you.

Screening programmes

There is no national screening programme for fatty liver disease. If you have risk factors — extra weight around the middle, type 2 diabetes, high cholesterol, or high blood pressure — it is worth asking your doctor whether a liver blood test or scan is sensible. Routine blood tests in people with these conditions often pick up early liver changes.

Complications

If left untreated

• The liver can become inflamed, a stage sometimes called steatohepatitis
• Scarring can build up in the liver (fibrosis), and over many years can become cirrhosis
• Cirrhosis can lead to a badly damaged liver that stops working properly
• Liver cancer is a risk in people with cirrhosis
• Higher risk of heart attacks and strokes, which is one of the most important health risks linked to fatty liver
• Tiredness, poor sleep, and low mood that affect daily life

Long-term outlook

The outlook is often good, especially when fatty liver is found early. Many people can reduce the fat in their liver and even reverse early changes with steady lifestyle changes, and most people never develop serious liver disease. Even with some scarring, there is much you can do to protect your liver and your heart, and doctors are learning more all the time. Take it one step at a time, and keep your healthcare team close — they are there to help you.

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