Even Occasional Heavy Drinking Could Triple Your Risk of Liver Damage

Fresh evidence suggests that “saving” all your alcoholic drinks for weekends or special occasions — even if you otherwise abstain — may pose significant risks to your liver.

“An important takeaway is not just the total number of drinks you have in a week. The pattern of your drinking matters,” says the lead author, Brian P. Lee, MD, a hepatologist and a liver transplant specialist at Keck Medicine of USC in Los Angeles.

Study Found Higher Risk With Occasional Heavy Drinking

Study participants all drank about the same amount of alcohol per week, but they differed in how often they drank and how much they had in one sitting. Of those with MASLD, 15.9 percent of participants reported heavy drinking days, defined as four or more drinks in one day for women or five or more for men, at least once a month.

Compared with participants who never had heavy drinking days, those who did were:

• Nearly three times more likely to have advanced liver scarring
• About 70 percent more likely to have earlier-stage scarring

That difference showed up clearly in the data: About 24 percent of people who had heavier drinking days had signs of liver damage, compared with 15.6 percent of those who didn’t.

“The magnitude of these findings surprised me. The fact that about 16 percent of people with MASLD had episodic heavy drinking is a large number, and it suggests this pattern may be more common than we think,” says Dr. Lee.

“I have patients ask me whether they can avoid drinking during the week and then have all their drinks on the weekend. This study suggests that the answer is no,” he says.

Most People Don’t Know They Have MASLD

MASLD is the most common type of chronic liver disease in the United States.

“Any one of these risk factors can also increase your risk of fat buildup in the liver,” says Dr. Banini, who wasn’t involved in the new study.

But fat doesn’t belong in the liver, and over time this misplaced fat can cause inflammation and scarring, says Lee.

The tricky part is that many people don’t even know they have MASLD. “You need very little healthy liver to feel well, so many people with even advanced liver disease have no symptoms at all,” he says.

Most of the time the condition is found incidentally in labs or imaging, says Banini.

Why Having Several Drinks at Once May Be Harder on the Liver

The study suggests that drinking a lot in one sitting puts more stress on the liver than one or two drinks on a more frequent basis.

“It takes time for the liver to process alcohol. When a large amount is consumed at once, you're not letting the liver have enough time to process and metabolize the alcohol, which really causes increased damage to the liver. In a sense, you're overwhelming the liver,” says Lee. That increases inflammation, which can lead to scarring and damage, he says.

More Research Is Still Needed

The study used a large, nationally representative sample and included imaging to assess liver scarring, which gives a clearer picture than blood tests alone.

But because of the design of the study, which captured just a snapshot from a single moment in time, it can’t prove whether episodic heavy drinking directly causes these outcomes, says Lee.

“Future research needs to look at whether this pattern of drinking increases the risk of complications like liver failure, transplant, or death,” he says.

Additionally, participants self-reported how much they drank, and people often underestimate the true amount.

Can the Liver Recover if You Stop Drinking?

The liver has a strong ability to heal, especially in the early stages.

“Liver disease is reversible, especially early on. If alcohol is contributing and someone stops drinking, there can be significant improvement, and in some cases, even full reversal,” Lee says.

The fat buildup typically improves within weeks, says Banini.

“If scarring is present, recovery is more gradual. It may take months or even years, and in some cases may not fully reverse,” says Lee.