Fatty liver, or steatosis, is a broad term that describes the buildup of
fats in the liver. Having fat in your liver is normal, but if more than 5 to 10
percent is fat, then it’s called fatty liver disease.
Fatty liver is a reversible condition that can be resolved with:
- alcohol avoidance
- other lifestyle changes
Fatty liver often has no symptoms and typically
does not cause any permanent damage.
The liver is the second largest organ in the body. The liver’s function is
to process everything we eat or drink and filter any harmful substances from
the blood. This process is interfered with if too much fat has accumulated in
the liver. The liver commonly repairs itself by rebuilding new liver cells when
the old ones are damaged. When there is repeated damage to the liver, permanent
scarring takes place. This is called cirrhosis.
Fatty liver is quite common. Around 10 to 20 percent of Americans have too
much fat in their liver, but no inflammation or damage is present. Most cases
of fatty liver are detected between ages 50 and 60. When fatty liver is caused
by an underlying condition, it can become harmful to the liver if the cause is
not recognized and treated.
What Are Symptoms
and Causes of Fatty Liver?
There are typically no symptoms of fatty liver. Some people experience
fatigue or vague abdominal discomfort. The liver may become slightly enlarged —
which your doctor will notice with a thorough physical exam.
If the liver has become inflamed, there may be other symptoms, such as poor
appetite, weight loss, and feeling extremely weak, sick, or tired.
The most common cause is alcoholism. Almost all heavy drinkers have fatty
liver disease. Other causes are toxins, certain drugs, and inherited metabolic
disorders. In many cases, doctors are not exactly sure what causes fatty liver
in people who aren’t alcoholics, but it has been associated with high blood
cholesterol, obesity, and type 2 diabetes.
Fatty liver develops when the body creates too much fat or cannot metabolize
fat fast enough. As a result, the leftover is stored in liver cells where it
accumulates to become fatty liver disease. Eating a high-fat diet does not
directly result in fatty liver.
Besides alcoholism, other common causes of fatty liver include:
- hyperlipidemia (high levels of fats in the
- genetic inheritance
- rapid weight loss
- side effect of certain medications, including
aspirin, steroids, tamoxifen, and tetracycline
What Are the Types
of Fatty Liver?
There are four types of fatty liver.
Nonalcoholic fatty liver (NAFL) develops when the liver has difficulty
breaking down fats, which causes a buildup in the liver tissue. The cause is
not related to alcohol. NAFL is diagnosed when more than 10 percent of the
liver is fat.
Alcoholic fatty liver is the earliest stage of alcohol-related liver
disease. The liver is damaged by heavy drinking and unable to break down fats.
If the patient abstains from alcohol, the fatty liver will go away. Within six
weeks of being alcohol-free, the fat will disappear. However, if excessive
alcohol use continues, cirrhosis may develop.
When the fat builds up enough, it will cause the liver to swell. If the
original cause is not from alcohol, it’s called NASH. This disease can impair
liver function. Symptoms can be seen with this disease, such as loss of
appetite, nausea, vomiting, abdominal pain, and yellowing of the skin. If left
untreated, NASH can progress to permanent scarring of the liver and eventual
Acute Fatty Liver
This is a rare complication of pregnancy that can be life threatening.
Symptoms begin in the third trimester and include persistent nausea and
vomiting, pain in the upper-right abdomen, jaundice, and general malaise. Women
who are pregnant will be screened for this condition. Most women improve after
delivery and have no lasting effects.
Who's at Risk for
Since fatty liver is the buildup of extra fats in the liver, it’s more
likely to develop if you’re overweight or obese.
Other factors that may increase your risk for fatty liver are:
- excessive alcohol use (drinking large amounts of
alcohol can damage your liver)
- excessive use of over-the-counter medication (taking
more than the recommended doses of certain medications, such as
acetaminophen, can increase your risk of fatty liver)
- type 2 diabetes (fat accumulation in the liver has been
linked to insulin resistance, the most common cause of type 2 diabetes)
- high cholesterol
- high triglyceride levels
- metabolic syndrome
How Is Fatty Liver
If the liver has become inflamed, your doctor can detect it by examining the
abdomen. An extensive history may reveal fatigue or loss of appetite as well. A
thorough history will include alcohol, medication, and supplement use.
Higher than normal liver enzymes may be found on a routine blood test. This
does not confirm a diagnosis of fatty liver. Further analysis will look for the
cause of inflammation.
The fat on your liver will show up as a white area on the image. Other
imaging studies may be done as well such as a CT scan or MRI. Imaging studies
can detect fat in the liver, but will not be able to confirm any further
A needle is inserted into the liver to remove a piece of tissue for
examination (after giving a local anesthetic to lessen the pain). This is the
only way to know for certain if you have fatty liver. The biopsy will also help
your doctor determine the exact cause.
How Is Fatty Liver
Treated and Prevented?
Treatment focuses on the factors that may cause the disease. Common
interventions center around:
- treatment of alcoholism
- cholesterol management
- weight loss
- blood sugar control
To reduce your risk of fatty liver, make healthy lifestyle choices, such as:
- limiting or avoiding alcohol consumption
- eating a healthy diet
- maintaining a healthy weight
What Is the
Long-Term Outlook for Fatty Liver?
Most cases of fatty liver will not lead to progressive liver disease. If the
cause is related to high cholesterol, diabetes, or obesity, then treating the
cause will reverse the fatty liver process.
If the cause is alcoholism, cessation of drinking may allow
the liver to heal completely. A biopsy can determine if there is permanent
damage, how bad the damage is, and how it needs to be treated.
Learn more about your liver and how it works with Healthline’s