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Weight loss can help head off lasting damage caused by fatty liver

Non-alcoholic fatty liver disease is the most common cause of liver disease in the United States, and is estimated to affect up to a quarter of adults in the world. It is defined by excess fat accumulating in the liver and usually occurs in people with obesity, high blood sugars (diabetes), abnormal cholesterol or triglyceride levels, or high blood pressure. These disorders often run together and as a group are called metabolic syndrome. The “non-alcoholic” part of “non-alcoholic fatty liver disease” is important to distinguish it from alcohol-related liver disease, which can also cause excess liver fat.

How fat can damage the liver

In some people, the excess fat sits in the liver but may not cause any liver damage. However, in about one in 20 people, excess liver fat triggers chronic liver inflammation. This condition is called non-alcoholic steatohepatitis or NASH (“steato-“ means relating to fat and “hepatitis” means liver inflammation).

As with other liver disease, such as viral hepatitis or alcohol-related liver disease, chronic inflammation can cause ongoing damage, which leads to liver scarring known as fibrosis. Severe fibrosis is called cirrhosis regardless of the cause. People with cirrhosis are at risk for liver failure and liver cancer, and may need liver transplantation.

Diagnosing fatty liver

The key to preventing complications of NASH is to catch it early and treat it before the liver has sustained significant damage. Early diagnosis is tricky; usually people have no symptoms from their liver disease. If you have been diagnosed with any of the components of metabolic syndrome, you should talk to your doctor about your risk of having NASH.

The most accurate way to diagnose NASH is by liver biopsy. But blood tests and imaging tests can be used to determine who might be at low risk for NASH to avoid unnecessary liver biopsies. A useful, noninvasive test for some people is liver elastography, a special kind of ultrasound that estimates how much scarring there is in the liver. Elastography can help sort out who might benefit from further testing by liver biopsy. Regardless of whether NASH is present, exercising and eating a healthy diet can go a long way in treating metabolic syndrome and preventing complications down the road.

Weight loss is key to preventing complications of fatty liver

For people who are overweight or have obesity, the best treatment for NASH is weight loss. A landmark study showed that losing 10% of one’s body weight can reduce liver fat, resolve inflammation, and potentially improve scarring. More recently, in a meta-analysis published in JAMA Internal Medicine, re

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Written by Shobha


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