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A US study found men and women in their 50s and 60s with a history of alcohol abuse were more likely to have memory problems up to two decades later.

The study, in The American Journal of Geriatric Psychiatry, adds to growing evidence that excessive drinking can impair mental processing later.

Researchers say it is a public health issue that needs to be addressed.

Scientists questioned 6,500 US middle-aged adults about their past alcohol consumption.

They were asked three specific questions:

Had people annoyed them by criticising their drinking?

Had they ever felt guilty or bad about their drinking?

Had they ever had a drink first thing in the morning to steady nerves or get over a hangover?

Those who answered yes to one of these questions were considered to have a problem with alcohol.

They had more than double the risk of developing severe memory impairment, the study found.

"We know that alcohol is bad for the brain in general, but it's not just how much you drink but how it affects you," lead researcher, Dr Iain Lang, from the University of Exeter Medical School, told the BBC.

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