"Pre-drinking" or "pre-loading" is something most of us associate with university days gone by, but new research suggests middle-aged people are just as guilty of hitting the booze before they leave the house.
The study found people over the age of 35 are not only drinking alcohol at home before they go out but also rounding off the evening with more drinks in their own homes or at a friend's house.
John Holmes, a senior research fellow with the University of Sheffield's Alcohol Research Group, said people were drinking 14 units each on average - about a bottle and a half of wine - per occasion.
"Generally, we only talk about young people pre-loading but this is also an issue among older age groups," he told the Press Association.
"For those in middle-age, it's probably not drinking before going out and tearing up the town, but it leads to them consuming the same amount as younger age groups, which obviously affects their health long-term if they're doing it regularly."
The study questioned more than 60,000 people about their drinking in the previous week and found that almost a quarter (23%) of people had been out drinking in multiple locations on one night - such as at home and a pub - and had drunk heavily.
"When we looked at this in more detail, it seemed that people were pre-loading and post-loading - drinking when they got back home," Holmes said.
"It might be that you're going out to dinner with friends and you open a bottle of wine before you go, or you go for Sunday lunch and then have a beer in the garden afterwards.
"People are drinking both before and after going to restaurants and pubs."
The researchers found that couples who like to stay at home and drink on weekends typically consume more than a bottle of wine each.
However, the overall study found that, of almost 190,000 drinking occasions examined, almost half are moderate, relaxed and take place in the home.
Drinking at home alone accounted for 14% of occasions, light drinking at home with family made up 13%, light drinking at home with a partner accounted for 20% and heavy drinking at home with a partner was 9%.
Some 11% of occasions were when people went out with friends while 9% were people going out for a meal as a couple or with family.
Around 10% of occasions involved drinking heavily at both home and the pub.
"It's not just young people who are drinking on these occasions," Holmes said.
"Even among the over-35s you are talking about consuming 10, 11, 12 units of alcohol per person."
James Nicholls, director of research and policy development at Alcohol Research UK, which funded the study, commented: "Rather than assuming society is neatly divided between 'binge', 'heavy' or 'moderate' drinkers we should think about the occasions on which people drink more or less heavily - and the fact we may be moderate in some contexts and less so in others."
The study is published online in the journal Addiction.
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