Journal
AMERICAN JOURNAL OF GERIATRIC PSYCHIATRY
Volume 17, Issue 7, Pages 542-555Publisher
ELSEVIER SCIENCE INC
DOI: 10.1097/JGP.0b013e3181a2fd07
Keywords
Alzheimer disease; vascular dementia; mild cognitive impairment; epidemiology; systematic review; alcohol drinking
Categories
Funding
- Australian Government Initiative
- NHMRC [366756]
- Australian National University
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The relationships between alcohol consumption and dementia and cognitive decline were investigated in a systematic review including meta-analyses of 15 prospective studies. Follow-ups ranged from 2 to 8 years. Meta-analyses were conducted on samples including 14,646 participants evaluated for Alzheimer disease (AD), 10,225 participants evaluated for vascular dementia (VaD), and 11,875 followed for any type of dementia (Any dementia). The pooled relative risks (RRs) of AD, VaD, and Any dementia for light to moderate drinkers compared with nondrinkers were 0.72 (95% CI = 0.61-0.86), 0.75 (95% CI = 0.57-0.98), and 0.74 (95% CI = 0.61-0.91), respectively. When the more generally classified drinkers, were compared with nondrinkers, they had a reduced risk of AD (RR = 0.66, 95% CI = 0.47-0.94) and Any dementia (RR = 0.53, 95% CI = 0.53-0.82) but not cognitive decline. There were not enough data to examine VaD risk among drinkers. Those classified as heavy drinkers did not have an increased risk of Any dementia compared with nondrinkers, but this may reflect sampling bias. Our results suggest that alcohol drinkers in late life have reduced risk of dementia. It is unclear whether this reflects selection effects in cohort studies commencing in late life, a protective effect of alcohol consumption throughout adulthood, or a specific benefit of alcohol in late life. ( Am J Geriatr Psychiatry 2009; 17:542-555)
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