Alcohol use and dementia: a systematic scoping review

Area of Science:

• Neuroscience
• Public Health
• Epidemiology

Background:

• Alcohol consumption is a known risk factor for cognitive decline and dementia.
• However, certain drinking patterns may offer protective effects against cognitive impairment.

Purpose of the Study:

• To comprehensively review the scientific literature on the relationship between alcohol use and dementia.
• To synthesize findings from systematic reviews examining alcohol's impact on cognitive function and brain health.

Main Methods:

• A scoping review methodology was employed, systematically searching major databases (Medline, Embase, PsycINFO).
• Included were systematic reviews published between January 2000 and October 2017, focusing on alcohol use and cognitive outcomes.
• Twenty-eight relevant systematic reviews were analyzed.

Main Results:

• Light to moderate alcohol consumption in middle to late adulthood was linked to a reduced risk of cognitive impairment and dementia.
• Heavy alcohol use demonstrated associations with detrimental brain structural changes, cognitive deficits, and elevated dementia risk.
• Causal relationships could not be definitively established, but strong associations were observed.

Conclusions:

• Reducing heavy alcohol intake may serve as a viable strategy for dementia prevention.
• Understanding nuanced drinking patterns is crucial for public health recommendations regarding cognitive health.
• Further research may elucidate the precise mechanisms underlying alcohol's complex effects on the brain.