There were a couple of articles just few days ago how alcohol may actually improve memory.
Blackouts are different matter but they affect short term memory only anyway.
May help with memory 'may' being key and only low amounts with low alcohol content of 2.5% and so far only it's only been studied using rats.
People who drink regularly drink too much alcohol and people who rarely or don't drink won't drink enough since the study said it had to be every day at low amounts.
