Drink alcohol to lower dementia risk

http://www.medscape.com/viewarticle/706325

Moderate Alcohol Consumption May Lower Dementia Risk in Cognitively Normal Elderly

"Moderate alcohol consumption may lower dementia risk in cognitively normal older subjects, but any level of alcohol consumption in individuals with mild cognitive impairment (MCI) appears to be detrimental."

Pay attention to the "but" part. If there's already sign of cognitive impairment, drinking alcohol is even worse than not doing it.