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BMC Geriatrics
Published in: BMC Geriatrics 1/2016

Open Access 01-12-2016 | Research Article

Environmental risk factors for dementia: a systematic review

Authors: Lewis O. J. Killin, John M. Starr, Ivy J. Shiue, Tom C. Russ

Published in: BMC Geriatrics | Issue 1/2016

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Abstract

Background

Dementia risk reduction is a major and growing public health priority. While certain modifiable risk factors for dementia have been identified, there remains a substantial proportion of unexplained risk. There is evidence that environmental risk factors may explain some of this risk. Thus, we present the first comprehensive systematic review of environmental risk factors for dementia.

Methods

We searched the PubMed and Web of Science databases from their inception to January 2016, bibliographies of review articles, and articles related to publically available environmental data. Articles were included if they examined the association between an environmental risk factor and dementia. Studies with another outcome (for example, cognition), a physiological measure of the exposure, case studies, animal studies, and studies of nutrition were excluded. Data were extracted from individual studies which were, in turn, appraised for methodological quality. The strength and consistency of the overall evidence for each risk factor identified was assessed.

Results

We screened 4784 studies and included 60 in the review. Risk factors were considered in six categories: air quality, toxic heavy metals, other metals, other trace elements, occupational-related exposures, and miscellaneous environmental factors. Few studies took a life course approach. There is at least moderate evidence implicating the following risk factors: air pollution; aluminium; silicon; selenium; pesticides; vitamin D deficiency; and electric and magnetic fields.

Conclusions

Studies varied widely in size and quality and therefore we must be circumspect in our conclusions. Nevertheless, this extensive review suggests that future research could focus on a short list of environmental risk factors for dementia. Furthermore, further robust, longitudinal studies with repeated measures of environmental exposures are required to confirm these associations.
Appendix
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Metadata
Title
Environmental risk factors for dementia: a systematic review
Authors
Lewis O. J. Killin
John M. Starr
Ivy J. Shiue
Tom C. Russ
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Geriatrics / Issue 1/2016
Electronic ISSN: 1471-2318
DOI
https://doi.org/10.1186/s12877-016-0342-y

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Year in Review: Heart failure and cardiomyopathies

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Watch this official video from ACC.24. Dr. Biykem Bozkurt discuss last year's major advances in heart failure and cardiomyopathies.

Semaglutide benefits people with type 2 diabetes and obesity-related heart failure

16-04-2024 Type 2 Diabetes News

Incentivised to exercise

11-04-2024 Lifestyle Modifications News

New intervention for STEMI-related cardiogenic shock

10-04-2024 Myocardial Infarction News

» View more highlights on the ACC 2024 congress hub page

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