In most cases drinking alcohol increases your chances of developing diseases, in one - cardiovascular disease - many doctors think drinking alcohol protects you against cardiovascular disease.
A new study from Oxford University considered research that has been carried out on alcohol and health risks, and looked specifically at 11 diseases that have been linked to alcohol.
The study found that the death rate was lowest when the average consumption was just half a unit of alcohol a day.
That's less than the smallest glass of wine you can buy in a pub - about half a small glass. It's about quarter of a pint of beer. And if that was the average consumption in England there would be 4,600 fewer deaths each year.
More top news
The 100 leaders did not agree on concrete proposals, but the meeting has raised hopes for concrete international agreement next December.
The speech was OK, passionate at times and certainly well received, but did not display the passion of past speeches.
The brother-in-law of a British hostage being held by Islamic State militants in Syria, says he is scared by US airstrikes in the country.