Weight and Metabolic Conditions
Obesity is a major risk factor. An estimated 30 to 90% of adults with obesity have non-alcoholic fatty liver disease. Type 2 diabetes, high cholesterol, and metabolic syndrome also raise risk.
AI Summary Fatty liver disease (MASLD/NAFLD) is a buildup of excess fat in the liver that often causes no symptoms, and it can frequently be stopped or reversed with weight loss, healthy eating, and regular exercise.
Fatty Liver DiseaseMetabolic Dysfunction-Associated Steatotic Liver Disease (MASLD), formerly NAFLD
Medically reviewed.
Fatty liver disease, also called MASLD (formerly NAFLD), happens when too much fat builds up in the liver cells. It is the most common liver disease in the Western Hemisphere, and roughly 1 in 4 people are affected.
It is usually linked to being overweight, unhealthy eating, little physical activity, and conditions such as insulin resistance and diabetes. It often causes no symptoms, so many people learn about it from a routine blood test.
Left untreated, fat buildup can lead to inflammation, scarring, and cirrhosis. The good news: with weight loss, healthy eating, and regular exercise, fatty liver can often be stopped or reversed.
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About fatty liver disease
What Is Fatty Liver Disease?
Fatty liver disease develops when too much fat builds up in the liver cells. A small amount of fat is normal. The liver is considered fatty when fat makes up more than about 5% of its weight. This is usually tied to unhealthy eating habits and a lack of physical activity.
There are two types. Non-alcoholic fatty liver disease (NAFLD, now also called MASLD) is not caused by alcohol. Alcoholic fatty liver disease, also called alcohol-related liver disease (ARLD), is caused by heavy drinking. This page focuses on the non-alcoholic type.
Over time, fat buildup can cause inflammation and then scarring. If left untreated, severe liver damage can follow, raising the risk of liver cancer and liver failure. Because early fatty liver often causes no symptoms, it can go unnoticed for years.
How fatty liver may feel
Symptoms of Fatty Liver Disease
Fatty liver is often a silent condition with little or no symptoms. Most people find out through a blood test that shows elevated liver enzymes, which is why regular checkups matter.
Common Symptoms
- Weakness
- Extreme tiredness or fatigue
- Nausea
- Loss of appetite
- Pain in the abdomen
- Unexplained weight loss
Signs of More Advanced Disease
- Jaundice (yellowing of the skin and eyes)
- Itching
- Swelling
- Mental confusion
Getting checked
How Is Fatty Liver Disease Diagnosed?
Because fatty liver often causes no symptoms, it can be hard to diagnose. Doctors combine your history with lab and imaging tests.
- Medical History and Physical Exam
- Your doctor will ask about your alcohol use and the medications you take. They will also check your height and weight and look for signs of an enlarged liver or cirrhosis.
- Blood Tests
- A liver function test can show elevated liver enzymes, which may point to a fatty liver.
- Imaging Tests
- An ultrasound, CT scan, or MRI can show fat in the liver. A FibroScan is a quick, painless ultrasound-based test that estimates liver stiffness and fat content, helping doctors stage the disease without a biopsy.
- Liver Biopsy
- A small sample of liver tissue is taken with a needle when other tests are not conclusive.
Talk With Your Doctor
Your doctor can help you choose the best diagnostic option for your situation.
Who's at risk
Who Is at Risk for Fatty Liver Disease?
Other Medical Conditions
An under-active thyroid, other metabolic disorders, and hepatitis infections can also increase the risk of fatty liver disease.
Age, Alcohol, and Children
Older people and heavy drinkers are especially at risk. Fatty liver is also becoming more common in children because of the childhood obesity epidemic.
How fatty liver develops
What Causes Fatty Liver Disease?
Experts are still unsure exactly why some people build up liver fat and others do not. Research points to a mix of lifestyle habits and medical conditions.
Lifestyle and Weight
- Being overweight or having obesity.
- Unhealthy eating, including too much fatty food, sugar, and soda.
- Poor lifestyle habits, such as little physical activity.
- Insulin resistance and diabetes, particularly type 2.
Medical Conditions and Other Factors
- High cholesterol and other metabolic disorders.
- An under-active thyroid.
- Hepatitis infections.
- Heavy drinking, which causes the alcoholic type.
The Bottom Line
Most fatty liver is tied to weight, diet, and metabolic health. A liver-healthy lifestyle can greatly lower your chances of developing it.
Treatment & reversal
How Is Fatty Liver Disease Treated?
Lifestyle Change Comes First
Fatty liver disease can be reversed, though it can be hard for many people. Doctors recommend a full lifestyle change as the first treatment step. If these changes are not kept up, the disease may continue to progress.
Weight, Exercise, and Eating
Losing weight if you are overweight, building a regular exercise routine, and eating in a liver-healthy way are the core steps. Limiting alcohol and medication intake also helps.
Ongoing Care With Your Doctor
Fatty liver is often silent, so regular checkups let your doctor monitor your liver and adjust your plan. Take any medications exactly as prescribed, and ask your doctor to help you build a treatment plan.
When to get checked
When Should You See a Doctor?
Warning Signs That Need Attention
See your doctor if you notice jaundice, abdominal pain or swelling, unexplained weight loss, extreme fatigue, or confusion. These can signal more advanced liver disease.
Don't Wait for Symptoms
Fatty liver often causes no symptoms. If you have obesity, diabetes, high cholesterol, or other risk factors, ask your doctor about liver testing even if you feel fine. Catching it early gives you the best chance of reversing it.
Diet & liver health
Diet Guidance for Fatty Liver Disease
Eating a healthy diet is one of the best ways to protect your liver. Cutting back on fat, sugar, and salt supports the liver's natural ability to regenerate. You do not need to obsess over carb counts; focus on the quality of the food you eat.
Do not skip meals, and start the day with a high-fiber breakfast such as fruit and oatmeal. If your doctor has given you other diet instructions, follow those first.
Liver-Healthy Diet Basics for Fatty Liver
- Choose natural, unprocessed foods and skip fast food and junk food.
- Replace simple carbs with complex carbs rich in fiber, such as nuts, quinoa, and brown rice.
- Fill up on fruits and vegetables, and add berries, nuts, or seeds to breakfast.
- Favor plant protein such as lentils, chickpeas, and beans, and limit red meat.
- Cut back on added sugar, soda, salt, and fatty food.
- Avoid alcohol if possible, and stay hydrated.
Common questions
Frequently Asked Questions
Can fatty liver disease be reversed?
Yes, in many cases. Fatty liver disease can be reversed through weight loss, healthy eating, regular exercise, and cutting down on alcohol. Reversal can be difficult for many people, because it takes lasting changes to daily habits. If those changes are not kept up, the disease may continue to progress to inflammation (NASH/MASH), scarring (fibrosis), and eventually cirrhosis, which may be irreversible. The earlier fat buildup is caught, the better the chance of turning it around. Ask your doctor to help you build a treatment plan.
Does fatty liver disease cause symptoms?
Often, no. Fatty liver is frequently a silent condition with little or no symptoms, and many people find out only through a blood test showing elevated liver enzymes. When symptoms appear, they can include weakness, nausea, loss of appetite, abdominal pain, and extreme fatigue. More advanced disease can cause jaundice (yellowing of the skin and eyes), itching, swelling, mental confusion, and unexplained weight loss. Because symptoms often appear late, regular checkups with your doctor are important.
What causes fatty liver disease?
Experts are still unsure exactly why some people build up liver fat and others do not. The non-alcoholic type is most likely linked to being overweight, unhealthy eating, poor lifestyle habits, and conditions such as insulin resistance and diabetes. High cholesterol, an under-active thyroid, other metabolic disorders, and hepatitis infections can also raise the risk. An estimated 30 to 90% of adults with obesity have non-alcoholic fatty liver disease. Heavy drinking causes the alcoholic type.
How is fatty liver disease diagnosed?
Doctors usually start with your medical history, including alcohol use and medications, and a physical exam that looks for signs of an enlarged liver or cirrhosis. A blood test (liver function test) can show elevated liver enzymes. Imaging such as ultrasound, CT scan, or MRI can show fat in the liver, and a FibroScan can estimate liver stiffness and fat content without a biopsy. A liver biopsy, where a small tissue sample is taken, may be used when other tests are not conclusive. Your doctor can help you choose the right option.
How is fatty liver disease treated?
Lifestyle change is the first step. Doctors recommend regular exercise, weight loss if you are overweight, healthy eating, and limited alcohol and medication intake. Taking any medications exactly as your doctor prescribes is also part of the plan. There is no single cure-all treatment, so steady habits matter most. Regular checkups let your doctor monitor your liver and adjust your plan over time.
What should I eat if I have fatty liver disease?
Focus on natural, unprocessed foods. Choose fruits, vegetables, nuts, quinoa, and brown rice, and favor plant proteins such as lentils, chickpeas, and beans over red meat. Cut back on sugar, soda, salt, and fatty food, and avoid fast food and junk food. Do not skip meals, and start the day with a high-fiber breakfast such as fruit and oatmeal. If possible, avoid alcohol entirely, since it can harm the liver, especially if you already have liver disease.
Can fatty liver disease become serious?
Yes. If left untreated, fatty liver can progress from fat buildup to inflammation, scarring (fibrosis), and cirrhosis, which can cause liver failure and raise the risk of liver cancer. This is why early detection matters. Following your doctor's recommended treatment plan and making lasting lifestyle changes can help stop fatty liver from progressing. See your doctor promptly if you notice jaundice, abdominal pain or swelling, or confusion.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.