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73/100

✓ Peer-reviewed alzhub usefulness score 73 out of 100. How common it is

Reviewed as evidence on: Alcohol intake and brain health / dementia 4 studies (what the news said). Being listed means the study bears on the question, not that it agrees with the news.

Topic: Risk, prevention and care in population studies

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.

Key findings

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.

Why it matters

Pooling 15 prospective studies with 2–8 years of follow-up, this meta-analysis found that light to moderate drinkers had lower relative risks than nondrinkers of Alzheimer disease (RR 0.72, 95% CI 0.61–0.86), vascular dementia (0.75, 0.57–0.98) and any dementia (0.74, 0.61–0.91). Drinkers did not show a lower risk of cognitive decline. The finding that heavy drinkers had no increased dementia risk "may reflect sampling bias," according to the authors. Because the cohorts began in late life, the authors say it is unclear whether the pattern reflects "selection effects," a lifelong effect of alcohol, or a late-life benefit, so the study does not show that drinking prevents dementia.

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Study details

Study designsystematic review
Participants14,646
Effect sizeRR = 0.66; RR = 0.53
Evidence strengthHigh

Limitations

This is an observational meta-analysis, so it cannot rule out that healthier non-drinkers, or other differences between drinkers and non-drinkers, contributed to the lower risk seen in light-to-moderate drinkers.

How this study scored 73/100

Published in a peer-reviewed journal, and it is a systematic review of all the studies on the question.

Component	Points	Why
Journal tier	7 / 10	Tier 3 — peer-reviewed journal (The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry)
Journal's citation record	2 / 4	American Journal of Geriatric Psychiatry: journal h-index 178 (OpenAlex, 2026-10-29)
Study design	12 / 12	A systematic review of all the studies on the question
Strength of evidence	5 / 5	Rated “high” in our summary
Peer-review validation	10 / 10	Peer-reviewed. Published as an article in a named peer-reviewed journal.
How recent	1 / 5	2009 — within 20 year(s) of the newest study here
Sample size	4 / 4	14,646 participants
Effect reported	3 / 3	Effect reported with a statistic (interval, p-value, ratio or similar)
Studied in people	3 / 3	Studied in people (participant count stated)
Randomised / blinded	0 / 2	A review of other studies — randomisation is not credited here
Times cited	6 / 7	Cited 454 times (OpenAlex, 2026-10-10)
Citations per year	4 / 5	23.9 citations a year over 19 year(s) since 2009
Impact for its field and year	3 / 6	Cited 3.5× the average for papers of its field and year (OpenAlex FWCI)
Cited by studies here	3 / 6	Cited by 24 other studies in this library
Still being cited	3 / 4	Cited 55 times in 2024–2026 (2026 still in progress; OpenAlex)
Senior author's track record	3 / 4	Last-listed author Nicolas Cherbuin: h-index 71 (OpenAlex, whole career)
Institution's track record	1 / 3	UNSW Sydney: institution h-index 1,101 (OpenAlex)
Multi-centre collaboration	1 / 3	OpenAlex lists 3 institution(s) in 1 country
Indexed in PubMed	2 / 2	Indexed in PubMed (PMID 19546653)
Free to read	0 / 2	Behind a paywall — scores zero
Total	73 / 100	—

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Cite this study APA, Vancouver, BibTeX · download .bib or .ris

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APA 7th

Anstey, K. J., Mack, H. A., & Cherbuin, N. (2009). Alcohol consumption as a risk factor for dementia and cognitive decline: meta-analysis of prospective studies. The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry. https://doi.org/10.1097/jgp.0b013e3181a2fd07

Vancouver

Anstey KJ, Mack HA, Cherbuin N. Alcohol consumption as a risk factor for dementia and cognitive decline: meta-analysis of prospective studies. The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry. 2009. doi:10.1097/jgp.0b013e3181a2fd07. PMID: 19546653.

BibTeX

@article{anstey2009-19546653,
  author  = {Anstey, K. J. and Mack, H. A. and Cherbuin, N.},
  title   = {{Alcohol consumption as a risk factor for dementia and cognitive decline: meta-analysis of prospective studies}},
  journal = {The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry},
  year    = {2009},
  doi     = {10.1097/jgp.0b013e3181a2fd07},
  pmid    = {19546653},
  url     = {https://doi.org/10.1097/jgp.0b013e3181a2fd07}
}

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