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J Gerontol A Biol Sci Med Sci. 2015 Oct;70(10):1248-54. doi: 10.1093/gerona/glv038. Epub 2015 Apr 16.

Midlife Alcohol Consumption and Risk of Dementia Over 43 Years of Follow-Up: A Population-Based Study From the Swedish Twin Registry.

Author information

1
School of Aging Studies, University of South Florida, Tampa. handing@mail.usf.edu.
2
School of Aging Studies, University of South Florida, Tampa. International Clinical Research Center, St. Anne's Hospital, Brno, Czech Republic.
3
International Clinical Research Center, St. Anne's Hospital, Brno, Czech Republic.
4
Department of Psychology, University of Southern California, Los Angeles. Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden.

Abstract

BACKGROUND:

Midlife alcohol consumption (beer, wine, and spirits) was examined in relation to dementia incidence over 43 years.

METHODS:

Participants were 12,326 members of the population-based Swedish Twin Registry born during 1907-1925 who responded to items about alcohol consumption in 1967/1970, subsequently classified as nondrinking (0 grams of ethanol per day), light (1-5g/d), moderate (5-12g/d), heavy (12-24g/d), and very heavy (>24g/d) drinking. Dementia was identified from the National Patient and Cause of Death Registries. Cox proportional hazard models adjusted for cluster-correlated data were used in cohort analyses. Conditional logistic regression (dementia-discordant pairs) and mixed effects models (dementia-concordant pairs) were used in twin analyses.

RESULTS:

Overall, nondrinkers did not differ from light drinkers in dementia risk. Heavy drinking (hazard ratio = 1.10, p = .028) and very heavy drinking (hazard ratio = 1.18, p = .033) were associated with increased dementia risk controlling for sociodemographic, lifestyle, and cardiovascular factors. More alcohol from spirits was related to increased risk of dementia, whereas more alcohol from wine with decreased risk, although the association for wine reversed direction at high amounts. Relative to co-twins drinking light amounts, moderate-to-heavy drinking twins had (a) greater risk of dementia by 57% (p = .006, 300% in monozygotic pairs only) and (b) reduced time to dementia by 4.76 years (p = .019, 4.78 years in monozygotic pairs only).

CONCLUSION:

Averaging more than 12 grams of alcohol per day may increase risk of dementia. Alcohol from spirits appears particularly important for the increased dementia risk. Genetic and/or familial factors do not explain these associations. Alcohol use reduction may be a useful population-wide intervention strategy.

KEYWORDS:

Dementia; Epidemiology; Risk factors

PMID:
25881581
DOI:
10.1093/gerona/glv038
[Indexed for MEDLINE]

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