[rebuilder]

The title doesn't seem accurate. The summary says:"Alcohol use disorders are the most important preventable risk factors... "

Furthermore, the article states:"This study looked specifically at the effect of alcohol use disorders, and included people who had been diagnosed with mental and behavioural disorders or chronic diseases that were attributable to chronic harmful use of alcohol."

So while I'm quite convinced that prolonged alcohol abuse has serious consequences, I don't think the claim that it is the single biggest risk factor of dementia across the population is supported by this study, as described by the article linked anyway.