Many people can drink far more than that in a single day.
Recommended alcohol limits in many countries should be lowered to around 100g/week for men and women, according to an analysis of data from almost 600,000 current drinkers in 19 countries published in medical journal, The Lancet.
A standard drink contains 10g of pure alcohol and is equivalent to a half-pint of 4.5% lager, a small glass of a wine or a pub measure of spirits.
Bearing in mind that the 2016 United Kingdom guidelines recommend no more than 14 units per week - or the equivalent of six pints of beer or seven glasses of wine - it sounds like a fair few of us could be in trouble.
Recommended drinking limits in the United States are now 98 grams for women and double for men - at two drinks per day - while limits in Italy, Spain and Portugal are nearly 50 percent higher.
The authors of the study said their findings also challenged the widely held belief that moderate drinking is beneficial to cardiovascular health, and support the UK's recently lowered guidelines.
"An important message from this study is that optimal life expectancy is associated with a relatively low level of alcohol consumption - less than 100 grams per week - and that higher levels of consumption increase mortality risk", Professor Yeap said.
The authors note that the different relationships between alcohol intake and various types of cardiovascular disease can be explained, at least in part, by the effect of alcohol consumption on elevated blood pressure and on factors related to lipoprotein cholesterol. The U.S. government guidelines specify that those people who are under the age of 65 should drink with a limitation for men of 14 a week and seven for women, i.e., two drinks a day for men and one drink for women.
The study's likely to be controversial, said Jason Connor and Wayne Hall of the University of Queensland Centre for Youth Substance Abuse Research in Australia.
The global team of researchers analyzed almost 600,000 people aged 30-100 from 19 different countries as part of 80 different studies. Consuming between 200-350g per week lowered life expectancy by one to two years, and more than 350g by up to five years. But even that is too much, according to this new study.
"The data make it even clearer that the alcohol industry is promoting a misleading view that alcohol use is benign", he says. They stress that the lower risk of non-fatal heart attack must be considered in the context of the increased risk of several other serious and often fatal cardiovascular diseases.
About half the people in the study reported drinking more than 100 grams of alcohol per week, and 8 percent drank more than 350 grams (12 ounces) per week. So the researchers, led by Cambridge University's Dr. Angela Wood, used only information about people who were current drinkers "because ex-drinkers include people who might have abstained from alcohol owing to poor health itself, as well as those who have changed their habits to achieve a healthier lifestyle", they wrote.