People who drink heavily 'alter their DNA to crave alcohol even more'
Heavy drinking can alter DNA in ways that increase the desire for alcohol, new research suggests.
The findings may help explain why alcohol addiction is so powerful and hard to resist, say scientists.
The US team looked at two genes that play a role in the control of drinking behaviour. One is PER2, which influences the body's biological clock, and the other POMC, which regulates stress responses.
The scientists then checked the DNA of groups of moderate and heavy drinkers, as well as binge-drinkers.
They discovered that the two genes had undergone "epigenetic" changes in both heavy and binge-drinkers, but not moderate drinkers. Their DNA had been affected by modifications that can turn genes on or off.
Senior researcher Professor Dipak Sarkar, from Rutgers University, said: "We found that people who drink heavily may be changing their DNA in a way that makes them crave alcohol even more.
"This may help explain why alcoholism is such a powerful addiction, and may one day contribute to new ways to treat alcoholism or help prevent at-risk people from becoming addicted."
The findings, published in the journal 'Alcoholism: Clinical & Experimental Research', were backed by experiments involving real-life responses to alcohol.
In the background to their research, the scientists cited a World Health Organisation report which said in 2016 more than three million people died as a result of alcohol abuse. More than three-quarters were men.