Wine appears to be particularly beneficial, probably as it plays a role in helping to manage blood sugar, the study, published in Diabetologia, says.
They surveyed more than 70,000 people on their alcohol intake - how much and how often they drank.
But experts said this wasn't a "green light" to drink more than recommended.
And Public Health England warned that consuming alcohol contributed to a vast number of other serious diseases, including some cancers, heart and liver disease.
"People should keep this in mind when thinking about how much they drink," a spokeswoman said.