The latest word is that this is where the previous idea about a cup of wine a day being good for you came from (it's not). Studies pursuing this question generally did not sufficiently control for the fact that people regularly drinking alcohol are in a state of health where they can regularly drink alcohol. It's not as easy to control for as it sounds because somebody might defer for reasons tied to possible health issues, but without even knowing it. Instead, just like you're talking about here simply not liking how it makes them feel.
