This article is confusing. I think what they are reporting is, if you have a drink everyday for a year it will age your brain at the rate of 7 days per gram of daily alcohol. They forgot to mention the "every day for a year" in the stat.
"The team found that for every gram of alcohol consumed a day, the brain aged 0.02 years — or, seven-and-a-half days. (The average can of beer or small glass of wine contains 14 grams of alcohol). People who reported drinking every day had brains which were, on average, 0.4 years older than people who didn't drink daily.
Smoking had even stronger effect: the team found that those who smoke a pack of cigarettes a day for a year age their brains by 0.03 years (11 days)."
The headline and the article are both poorly worded.
"The team found that for every gram of alcohol consumed a day, the brain aged 0.02 years — or, seven-and-a-half days. (The average can of beer or small glass of wine contains 14 grams of alcohol)"
It makes it sound like every drink you have ages your brain by a week and that's not actually what the study says. What it really says is if you have one drink a day for an entire year, it ages the brain 11 days.
I wish there was more information about past-history drinking. When I was in my teens (about 40 years ago), I drank quite a lot. I completely stopped about 20 years ago.
I feel much better, don't miss the hangovers, etc. I know that the ill effects of smoking are supposed to decrease after the smoking stops-- I hope it's true of drinking, too.
"The team found that for every gram of alcohol consumed a day, the brain aged 0.02 years — or, seven-and-a-half days. (The average can of beer or small glass of wine contains 14 grams of alcohol). People who reported drinking every day had brains which were, on average, 0.4 years older than people who didn't drink daily.
Smoking had even stronger effect: the team found that those who smoke a pack of cigarettes a day for a year age their brains by 0.03 years (11 days)."