Who knows. That is a really hard study to do. For some people a cold ice tea at the end of the day is that relaxing hit. For others its a beer or two. I imagine that a lot of it is genetics, some of it is culture.
Also, Beer/Wine played a critical role in humanity existing at all when water purification and sanitization systems were not widely available (or in some cases, even known about). Beer was safer to drink than water but it was very low ABV (same with wine).
In the end. Anything done to excess is probably bad for you. Some things done even in small amounts can kill you. Got to figure out what works for you and also what you are willing to trade off for it.
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