Dementia seems highly related, if not inversely synonymous, with mental clarity? I think your comment is a bit misleading - while it does seem clearer that _high_ alcohol consumption and alcohol "use-disorders" are correlated with elevated risk of dementia, results pertaining to light-to-moderate consumption are "heterogeneous" - I read 4 studies or meta-studies with results showing _decreased_ risk of dementia (Rotterdam, Whitehall-II, Anstey, Xhu), 2 showing no correlation (California, HUNT), and zero showing increased risk when it comes to light-to-moderate consumption. Anyone interested should of course read the linked text in full and draw their own conclusions.