Fatty Liver Disease: What It Is, What Causes It and What You Can Do
Fatty liver disease is becoming increasingly common, and many people have it without knowing. You can have fat building up in your liver for years without feeling sick or noticing obvious symptoms. That is why it is sometimes described as a silent condition.
The good news is that when fatty liver is found early, there is often a lot you can do to improve your liver health. The first step is understanding what is happening inside your body.
What does your liver actually do?
Your liver is one of the hardest-working organs in your body. It helps to:
- process the food you eat
- control how your body stores and uses sugar
- process fats
- make bile for digestion
- store vitamins and minerals
- process medicines and alcohol
- remove waste products from the blood
Your liver is working for you all day, every day. When too much fat starts building up inside the liver cells, we call this fatty liver disease.
Isn’t fatty liver caused by alcohol?
Not always. This is one of the biggest misunderstandings about fatty liver. Some liver disease is caused by heavy alcohol use, but many people develop fatty liver even though they drink very little alcohol or none at all.
The type linked to excess weight, high blood sugar, high cholesterol and insulin resistance is now commonly called MASLD — metabolic dysfunction-associated steatotic liver disease. The name sounds complicated, but the meaning is simple: fat has built up in the liver, and the person’s metabolism is not working as well as it should.
You may also still hear doctors use the older term non-alcoholic fatty liver disease, or NAFLD.
What causes fatty liver?
Fatty liver usually does not happen because of one single thing. It often develops gradually. Some of the most common risk factors include:
- being overweight, especially around the stomach
- insulin resistance
- prediabetes
- type 2 diabetes
- high triglycerides
- high cholesterol
- high blood pressure
- not being physically active
- regularly eating more calories than the body needs
- drinking a lot of sugary drinks
- certain medical conditions
- genetics
One of the most important links is insulin resistance.
What does insulin resistance have to do with your liver?
Insulin is a hormone that helps move sugar from your blood into your cells so your body can use it for energy. When you become insulin resistant, your body does not respond to insulin as well as it should. Your pancreas may then make more insulin to try to keep your blood sugar under control.
Over time, this can encourage the body to store more fat. Some of that fat can build up around your organs and inside your liver. This is one reason fatty liver, abdominal weight gain and type 2 diabetes are so often seen together.
Can you have fatty liver and not be overweight?
Yes. You do not have to be overweight to have fatty liver. Some people are slim on the outside but still have too much fat stored around their internal organs. Others may have insulin resistance, high triglycerides or a strong family history. So appearance alone cannot tell you whether your liver is healthy.
What are the symptoms of fatty liver?
This is where fatty liver can be tricky. Many people have no symptoms at all. When symptoms do happen, they may include:
- feeling tired
- low energy
- feeling generally unwell
- discomfort or a dull ache on the upper-right side of the stomach, under the ribs
But these symptoms can also be caused by many other conditions. That is why fatty liver should be properly assessed by a healthcare professional.
How do people find out they have fatty liver?
Sometimes it is discovered by accident. For example, your doctor may notice abnormal liver blood tests. Or you may have an ultrasound or another scan for a completely different reason and be told that your liver looks fatty. Doctors may use:
- blood tests
- ultrasound
- other imaging scans
- tests that estimate liver scarring
- your medical history
If necessary, you may be referred to a liver specialist.
What are the stages of fatty liver disease?
Fatty liver does not always become serious. Many people stay at the early stage. But in some people, the condition can progress.
Fat builds up in the liver
Sometimes called simple fatty liver. There is extra fat in the liver, but there may be little or no damage. Many people feel completely normal at this stage.
The liver becomes inflamed
In some people, the fatty liver starts becoming irritated and inflamed. This more serious form is now called MASH. Inflammation can damage liver cells over time.
Scarring begins
When the liver is repeatedly injured, scar tissue can start forming. This is called fibrosis.
Cirrhosis
Cirrhosis means the liver has developed severe scarring. At this stage, the liver may no longer be able to do its job properly.
This is why it is worth taking fatty liver seriously before it reaches an advanced stage.
Can fatty liver be reversed?
In many cases, early fatty liver can improve greatly. The liver has a remarkable ability to recover when the cause of the problem is addressed.
There is no special drink, tea or three-day cleanse that can magically remove fat from your liver.
What tends to help is improving your overall metabolic health — making steady changes that your body can maintain.
If you need to lose weight, even a small amount can help
You do not always need dramatic weight loss. For someone carrying excess weight, losing even a modest amount can reduce fat stored in the liver. The key is gradual, sustainable weight loss rather than crash dieting.
Very restrictive diets may be difficult to maintain and are not necessary for most people.
Reduce sugary drinks
This can be one of the simplest places to start. Soft drinks, sweetened juices, energy drinks and heavily sweetened coffees can contain a lot of sugar without making you feel full. Water should be your main drink, and unsweetened tea is another option.
And remember: eating a piece of whole fruit is very different from regularly drinking sugary fruit drinks. Whole fruit contains fibre and nutrients.
Eat more real food
You do not need an expensive liver diet. Focus on everyday foods such as vegetables, leafy greens, beans and lentils, whole fruits, whole grains, nuts and seeds, healthy oils and good-quality protein.
Try to reduce the amount of heavily processed food you eat every day. The goal is not perfection — it is to make your usual diet healthier.
Move more
Exercise helps your body respond better to insulin and helps your muscles use sugar for energy. You do not have to become an athlete — walking, swimming, cycling, dancing and gardening all count. Strength exercises are also valuable, especially as we get older, because maintaining muscle helps support healthy blood sugar and metabolism.
For many adults, working towards around 150 minutes of moderate activity each week is a useful goal. If you have not been active for a long time, start slowly.
Pay attention to your waistline
Fat stored around the stomach is more strongly connected with metabolic disease than fat stored in some other parts of the body. This does not mean becoming obsessed with the scale. It means that if your waistline has been steadily increasing, it may be worth checking your blood sugar, blood pressure, cholesterol and triglycerides.
Your body can often give you clues that your metabolism needs attention.
Manage diabetes and blood sugar properly
If you have diabetes or prediabetes, good blood sugar control is extremely important for your liver. Do not think of diabetes and fatty liver as completely separate problems — they are often connected, and taking care of one can help the other.
Be careful with alcohol
Even if alcohol did not cause your fatty liver, your liver still has to process it. If you have been diagnosed with fatty liver or another liver condition, ask your doctor how much alcohol, if any, is appropriate for you. Some people may be advised not to drink alcohol at all.
Sleep matters too
Poor sleep affects much more than tiredness. Not sleeping enough can affect appetite, blood sugar, stress hormones, weight and insulin sensitivity. Looking after your liver therefore means looking after your whole body.
Can herbs support liver health?
Herbal medicine has traditionally used certain plants to support digestion and liver function. Some commonly discussed herbs include milk thistle, artichoke, dandelion, turmeric and ginger. Researchers continue to study many plant compounds for their effects on the liver and metabolism.
Natural does not automatically mean safe. Herbs and supplements can interact with medicines, and some may be unsuitable for people who already have liver disease.
So if you have diagnosed fatty liver, take prescription medication or have other medical conditions, speak with a qualified healthcare professional before adding supplements. Herbs should support good health habits, not replace them.
Do you need a liver detox?
Your liver is already a detoxification organ. Its job is to process substances your body does not need and prepare them for removal. You do not need to starve yourself, live on juice or do an extreme cleanse.
A healthier approach is to reduce what is placing extra pressure on the liver. That may mean improving blood sugar, losing excess abdominal fat, reducing sugary drinks, eating better, moving more, drinking less alcohol and sleeping better.
Think support, not punishment.
The connection between fatty liver and other diseases
Fatty liver is often a warning that something bigger may be happening with your metabolism. People with fatty liver may also have a higher risk of:
- type 2 diabetes
- high blood pressure
- high cholesterol
- heart disease
- kidney problems
That is why a fatty liver diagnosis should not simply be ignored because you feel well. It can be an opportunity to make changes before more serious health problems develop.
When should you speak to your doctor?
Speak with a healthcare professional if:
- a scan has shown fatty liver
- you have abnormal liver blood tests
- you have type 2 diabetes
- you have prediabetes or insulin resistance
- you have high triglycerides
- you carry a lot of weight around your stomach
- you have ongoing unexplained tiredness or discomfort under your right ribs
Get urgent medical attention if you develop symptoms such as yellowing of the skin or eyes, severe swelling of the abdomen, confusion, vomiting blood, or black stools.
The message we want you to remember
Fatty liver disease sounds frightening, but an early diagnosis can also be a useful warning. It gives you a chance to look at your blood sugar, weight, food, movement, sleep and overall metabolic health.
You cannot change everything overnight — and you do not need to. Start with one thing. Walk more. Drink more water. Cut back on sugary drinks. Eat more vegetables. Get your blood sugar checked. Small habits repeated consistently can make a meaningful difference.
