According to the CDC, one in six American adults is a binge drinker:
The study — which defines binge drinking as five or more drinks in a short period of time for men and four or more for women — breaks down the nation’s 38 million binge drinkers by a variety of measures, including geography, age and income level. Wisconsin is the state with the most binge drinkers at 25 percent of the population, while Utah, home to the teetotaling Mormon church, comes in last at less than 11 percent. [...]
The CDC report noted that half of all alcohol consumed in the U.S. is consumed during binge drinking. For young people, that rate shoots up to 90 percent.
http://www.thedaily.com/page/2012/01/12/011212-news-binge-drinking/
in science circles, none of this would hold up, because there are NO definitive measurements given, either for the amount of alcohol consumed or the time period in which it should be consumed to be considered "excessive".
here's a good example: i can drink 10-12 beers on Friday and Saturday nights. but those beers are usually from my grocery store, which only sells 3.2% beer. now, the law (here) says that the beer sold by grocery stores can only be "3.2% ABV Maximum", and that doesn't mean that's what i've been drinking is actually that strong (or weak, depending on how you look at it.) so i could very well be drinking something that is 1 or 2% alcohol. oh, and it generally takes me a good 12 hours to finish off a "grocery store" 12-pack...so is THAT binge drinking, or just a slow burn?
i regularly go several days without drinking any alcohol...but does my weekend nights constitute "binge drinking"?? how much alcohol do i consume, and is it a reliably repeatable experiment? and how long do i have to continually consume "x" amount of booze to start having physical problems?
my point is that "studies" like this are useless without concrete, minute data. the amount of liquid in a "drink" is useless: it's the amount of alcohol that's important, and how often (and for how long) it's consumed to be of any importance.
Interestingly is seems that countries with a binge drinking problem are those where alcohol is now or has been previously demonized. Countries where alcohol is celebrated rather than demonized tend to have a much more mature attitude to alcohol.
I am also a little concerned that 5 average US beers would be considered binge drinking.
There used to be a saying here that a man had had too much to drink if he'd had "one over the eight". That is to say he'd drunk more than 8 pints. Or IOW more than an imperial gallon of beer (1.2 US gallons). Of course that was in the days before alcohol was blamed for all society's ills. A few years ago a politician talked about drinking 14 pints a night in his youth and people didn't believe him. Admittedly he was a Yorkshireman and the doubters were southern, but he probably wasn't lying. In my youth two gallons was considered a pretty good night.
http://www.mdguidelines.com/vitamin-b1-deficiency