A large long-term study was recently published which found that moderate alcohol use is very strongly associated with decreased risk of dementia. Too bad the design of the study is such that it cannot say if moderate use is 1 or 20 portions per week.
Alcohol consumption and risk of dementia: 23 year follow-up of Whitehall II cohort study
Alcohol consumption and risk of dementia: 23 year follow-up of Whitehall II cohort study