AARP Hearing Center
Metabolic dysfunction-associated steatotic liver disease (MASLD) might just be the most common disease you’ve never heard of.
The condition, which occurs when excess fat accumulates in the liver of a person who isn’t a heavy drinker, is the most common form of chronic liver disease, affecting roughly 34 percent of U.S. adults as of 2020 (and expected to affect 41.4 percent by 2050). Still, it isn’t on most people’s radar, even after its name was changed from nonalcoholic fatty liver disease in 2023.
“The biggest problem is low awareness among primary care doctors,” says Dr. Mary Rinella, a professor of medicine and the director of the Metabolic and Fatty Liver Disease Clinic at University of Chicago Medicine.
Indeed, research suggests primary care doctors aren’t always certain which patients to screen for MASLD. (Why test your teetotaling patients for a liver disease?)
Further complicating matters: Those who have the condition typically experience few, if any, symptoms. (How can you talk to your doctor about a condition you don’t even suspect you have?)
“It’s a common myth that only alcohol can damage the liver or cause scarring — also known as cirrhosis — but the truth is that fat buildup is a major cause of liver damage and can lead to liver failure and its most feared complication, liver cancer,” says Dr. Ani Kardashian.
“In fact, fatty liver is the second most common reason for liver transplants in the U.S.,” says Kardashian, who is an assistant professor of medicine in the division of gastroenterology and liver diseases at the Keck School of Medicine at the University of Southern California.
It’s normal for the liver to have some fat, but if more than 5 to 10 percent of your liver’s weight is fat, you have what’s known as a fatty liver. With MASLD, fatty liver happens in people who aren’t heavy drinkers.
The risk of MASLD is higher for people over age 50, particularly women.
“As adults age, they are more likely to develop high blood pressure, diabetes, high cholesterol or obesity, which are the principal risk factors for fatty liver,” Kardashian says. “In women, menopause is an additional hit. Estrogen is protective against fatty liver and liver scarring … and after women hit menopause, as estrogen levels drop, they lose that protective effect.”
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