Lots of countries have guidelines to tell you what are considered "safe" or "low-risk" drinking levels.
For instance, the British government recently altered its advice, lowering its recommended limit for men from 21 "units" a week to 14.
In theory, drinking 14 units a week will ultimately give you a 1% chance of dying of an alcohol-related condition.
But a new study has found that what is considered a "safe" drinking level varies enormously around the world.
The various countries don't even agree what a "drink" is.
It gets even more confusing when you start looking at how many of those drinks each country says you can safely drink a day.
What's more, some nations have different recommendations for men and women, while others (and the WHO) think they should have the same limits.
Others say that you're allowed to drink more on "special occasions".
Australia, Canada, Denmark, Fiji, France, Mexico, New Zealand, Poland, and the United Kingdom all say it's OK to break the usual limits on weddings and bar mitzvahs.
The study says the confusion may arise from the fact that the different countries are looking at different data to establish their recommendations.
It also says that "there is no robust evidence that the general population changes its level of alcohol consumption in response to governments defining standard drinks and publishing low-risk drinking guidelines", so these limits may not make much difference anyway.