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Combining modifiable risk factors and risk of dementia: a systematic review and meta-analysis
Open accessAbstract
Objective: To systematically review the literature relating to the impact of multiple co-occurring modifiable risk factors for cognitive decline and dementia. Design: A systematic review and meta-analysis of the literature relating to the impact of co-occurring key risk factors for incident cognitive decline and dementia. All abstracts and full text were screened independently by two reviewers and each article assessed for bias using a standard checklist. A fixed effects meta-analysis was undertaken. Data sources: Databases Medline, Embase and PsycINFO were searched from 1999 to 2017. Eligibility criteria: For inclusion articles were required to report longitudinal data from participants free of cognitive decline at baseline, with formal assessment of cognitive function or dementia during follow-up, and an aim to examine the impact of additive or clustered comorbid risk factor burden in with two or more core modifiable risk factors. Results: Seventy-nine full-text articles were examined. Twenty-two articles (18 studies) were included reporting data on >40 000 participants. Included studies consistently reported an increased risk associated with greater numbers of intraindividual risk factors or unhealthy behaviours and the opposite for healthy or protective behaviours. A meta-analysis of studies with dementia outcomes resulted in a pooled relative risk for dementia of 1.20 (95% CI 1.04 to 1.39) for one risk factor, 1.65 (95% CI 1.40 to 1.94) for two and 2.21 (95% CI 1.78 to 2.73) for three or more, relative to no risk factors. Limitations include dependence on published results and variations in study outcome, cognitive assessment, length of follow-up and definition of risk factor exposure. Conclusions: The strength of the reported associations, the consistency across studies and the suggestion of a dose response supports a need to keep modifiable risk factor exposure to a minimum and to avoid exposure to additional modifiable risks. Further research is needed to establish whether particular combinations of risk factors confer greater risk than others. PROSPERO registration number: 42016052914.
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“Increasing evidence also points to air pollution as an emerging risk factor for dementia, heart and cardiovascular disease and lung cancer.1,14”
From Common risk factors for major noncommunicable disease, a systematic overview of reviews and commentary: the implied potential for targeted risk reduction (2019) · cites this paper as [14]
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ResultRisk factors of male and female Alzheimer's disease patients with neuropsychiatric symptoms
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“Additionally, based on previous literature (24), the baseline comorbidity for each person included hypertension (ICD-9CM 401–405), stroke (ICD-9-CM 430–438), diabetes (ICD-9CM 250), heart disease (ICD-9-CM 410–429), chronic kidney disease (CKD) (ICD-9-CM 585), tobacco use (ICD-9-CM 305.”
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“Treatment and rehabilitation of persons with dementia is a significant concern given its substantial physical, psychosocial, and economic impact on them and their caregivers, family, and society (Killin et al., 2016; Karr et al., 2018; Peters et al., 2019; Lamech et al., 2019).”
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“These social relations, lifestyle behaviors, mental health disorders, and cardiovascular diseases are well-established determinants of cognitive health and dementia (5,22,23).”
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“4 15 While there are some studies documenting that dementia knowledge varies by educational attainment, 16 17 there is little evidence for the UK, especially based on samples representative of the general population.”
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“However, the evidence base is surprisingly scarce on the prevalence of risk factor combinations [3], and our study guides the priorities for future multidomain interventions and thus their implementation.”
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“It was reported that, compared with no risk factors, the relative risk for dementia was 1 · 20 for one risk factor, 1 · 65 for two and 2 · 21 for three or more risk factors (61) .”
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The Next Steps in Reducing Risk for Dementia
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The role of genomic‐informed risk assessments in predicting dementia outcomes
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“Dementia-related risk is also higher in smokers compared to that of never-smokers, with cessation of smoking for more than three years reducing the risk level to that of never-smokers [8-11].”
BackgroundA Multimodal Risk Network Predicts Executive Function Trajectories in Non-demented Aging
Sapkota, S., McFall, G. P., Masellis, M., & Dixon, R. A. (2021) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2021.621023 · Cited by 3
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“…review on combining multiple co-occurring modi fi able risk factors and risk of dementia noted that “ one risk factor is associated with a 20% increase in the risk of incident dementia, two risk factors with a 65% increased risk and three or more with a doubling risk ” (Peters et al., 2019, p. 19).”
BackgroundExperimental laboratory models as tools for understanding modifiable dementia risk
Sinclair, D., Canty, A. J., Ziebell, J. M., Woodhouse, A., Collins, J. M., Perry, S. E., Roccati, E., Kuruvilla, M. V., Leung, J. Y. K., Atkinson, R. A. K., et al. (2024) · Alzheimer s & Dementia · doi:10.1002/alz.13834 · Cited by 2
VASCULAR RISK FACTORS AND COGNITIVE FUNCTIONS IN THE PATIENTS WITH CEREBROVASCULAR DISEASE
Kopchak, O. O., Bachinskaya, N. Y., & Pulyk, O. R. (2020) · Wiadomości Lekarskie · doi:10.36740/wlek202010128 · Cited by 3
“Our results were comparable to the data of the two studies from the National Alzheimer Coordinating Center (NACC) cohort, in which low cognitive performance was linked with high treatable vascular risk independent of age [17,18].”
ResultMariman, J. J., Vergara, R. C., Martín, C. S., Zapata, V., Arteaga, O., Délano, P., & Derio, C. D. (2025) · BMC Public Health · doi:10.1186/s12889-025-22220-6 · Cited by 5
“In this context, previous research has shown a dose effect between the number of dementia risk factors and the development of dementia, but the interactions among dementia risk factors have been poorly studied [12].”
Association of healthy lifestyle with excess risk of dementia in individuals with hypertension
Lu, Y., Chang, J., Zhao, Y., Gao, P., & Tang, Y. (2025) · Journal of Alzheimer s Disease · doi:10.1177/13872877251344309 · Cited by 2
Manias, G., LIKOTHANASSIS, S. D., Alexakis, E., Antoniades, A., Marra, C., Giuffrè, G. M., Charalambous, E., Tsolis, D. K., Tsirogiannis, G. A., Koutsomitropoulos, D. A., et al. (2025) · Journal of dementia and Alzheimer's disease · doi:10.3390/jdad2030030 · Cited by 2
“During the last decade, several longitudinal studies try to raise awareness, advance research, and improve our understanding of dementia and frailty and have sought to identify modifiable risk factors for these conditions [36,37].”
Zheng, Y., Tang, P. K., Zhao, Y., Song, M., Hu, H., & Ung, C. O. L. (2025) · BMJ Open · doi:10.1136/bmjopen-2025-102523 · Cited by 2
“Such research findings will be highly useful to inform the optimisation and execution of the MDP. 44 Figure 2 An overview of the dementia care model after the launch of the dementia policy in Macao.”
Alzheimer Syndrome or Age-Related Dementia—History, Therapy and Prevention
Bermejo‐Pareja, F., & del Ser, T. (2025) · Journal of Clinical Medicine · doi:10.3390/jcm14217752 · Cited by 2
Vepakomma, V., Ramanujam, K., Angadi, K. K., Shalini, T., Mangialasche, F., Kivipelto, M., Suryadevara, V., & Reddy, G. B. (2026) · The Lancet Regional Health - Southeast Asia · doi:10.1016/j.lansea.2026.100794 · Cited by 2
“12 There are numerous models developed for dementia risk assessment, given that each risk factor contributes differently to overall risk, the CAIDE (Cardiovascular Risk Factors, Ageing, and Incidence of Dementia) score was developed, incorporating multiple non-modifiable (age, sex, education) and…”
Potentially Modifiable Risk Factors for Dementia in Lower- and Middle-Income Countries
Acosta, I., Álvarez, L., & Sosa, A. L. (2021) · Springer eBooks · doi:10.1007/978-3-030-70119-2_6 · Cited by 2
Bueno‐Notivol, J., Gracia‐García, P., Olaya, B., de la Cámara, C., López‐Antón, R., & Santabárbara, J. (2022) · The European Journal of Psychiatry · doi:10.1016/j.ejpsy.2022.09.006 · Cited by 2
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“The impact of dementia risk factors is cumulative, and individuals with more risk factors are more likely to develop dementia [11].”
BackgroundImplementation of the Macao dementia policy: a scoping review for the way forward
Tang, P. K., Cen, Z., Zheng, Y., Shi, J., Hu, H., & Ung, C. O. L. (2024) · Frontiers in Public Health · doi:10.3389/fpubh.2024.1400172 · Cited by 2
Walia, A., Shew, M. A., Durakovic, N., Herzog, J. A., Cirrito, J. R., Yuede, C. M., Wick, C. C., Manis, M., Holtzman, D. M., Buchman, C. A., et al. (2024) · Otolaryngology · doi:10.1002/ohn.942 · Cited by 2
Lin, R., Yan, Y., Huang, C., Zhao, J., Chen, M., & Li, H. (2025) · Scientific Reports · doi:10.1038/s41598-025-92535-2 · Cited by 2
Cardiovascular influence on cognitive decline: The heart’s role in neurodegenerative disorders
Gautam, G., & Moradikor, N. (2025) · Progress in brain research · doi:10.1016/bs.pbr.2025.04.006 · Cited by 2
Family caregivers’ perspectives on dementia prevention: A mixed-methods systematic review
Wu, Y., Zhi, S., Zhong, Q., Song, D., Gao, S., Fang, S., Jing, B., & Sun, J. (2025) · Geriatric Nursing · doi:10.1016/j.gerinurse.2025.05.004 · Cited by 2
Asante, J., Nagel, C., & Barger, S. W. (2025) · Journal of Alzheimer s Disease · doi:10.1177/13872877251351629 · Cited by 2
Son, S., Speechley, M. R., Zou, G., & Montero‐Odasso, M. (2025) · The Journal of Prevention of Alzheimer s Disease · doi:10.1016/j.tjpad.2025.100321 · Cited by 2
“Yet, limited evidence exists regarding the combined effects of particular combinations of risk factors [12,16].”
InfluentialSmagula, S. F., Biggs, M. L., Jacob, M. E., Rawlings, A. M., Odden, M. C., Arnold, A. M., Newman, A. B., & Buysse, D. J. (2022) · Psychosomatic Medicine · doi:10.1097/psy.0000000000001100 · Cited by 2
“A recent meta-analysis (15) found that, compared with individuals with no risk factors, dementia risk increased by 20% in people with one risk factor, 65% in people with two risk factors, and 100% in people with three or more risk factors.”
BackgroundRizzo, A. V., & Downer, B. G. (2022) · Gerontology and Geriatric Medicine · doi:10.1177/23337214221109823 · Cited by 2
“Light-moderate alcohol consumption in old age has been associated with higher cognition and lower dementia risk (Peters et al., 2019).”
BackgroundAssociation of mild cognitive impairment and physical activity level in older persons in Chile
Olivares-Tirado, P., & Garrido, F. A. S. (2022) · Aging and Health Research · doi:10.1016/j.ahr.2022.100107 · Cited by 2
Hajek, A., Kretzler, B., Riedel-Heller, S. G., Gyasi, R. M., & König, H. (2024) · BMC Geriatrics · doi:10.1186/s12877-024-05255-z · Cited by 1
“As outlined by previous systematic reviews/meta-analyses [15, 16], while there is research that investigates the factors leading to dementia among middle-aged or older adults, there is very limited knowledge regarding the determinants of dementia exclusively among the oldest old (e.g., [17–20] and…”
BackgroundKohli, M., Verstaen, A., & Trittschuh, E. H. (2025) · Journal of Applied Gerontology · doi:10.1177/07334648241310948 · Cited by 1
“…become increasingly susceptible to a host of potential medical complications (e.g., cardiovascular diseases, diabetes, and cerebrovascular insult) which may accelerate cognitive aging (Izzo et al., 2018; Lloyd-Jones et al., 2006; Lu et al., 2009; Peters et al., 2019; Yaffe et al., 2020).”
Korkki, S. M., Narbutas, J., Salami, A., Rydén, L., Kalpouzos, G., Andersson, M., Kern, S., Skoog, J., Westman, E., Skoog, I. G., et al. (2026) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2026.06.002 · Cited by 1
Neurodegenerative disease prevention: synergistic effects of micronutrients and a healthy lifestyle
Lapshina, O. V. (2025) · Pharmacy Formulas · doi:10.17816/phf685080 · Cited by 1
Updated systematic review on prognostic factors for 6-month mortality in older people with dementia
Albalawi, A. (2025) · BMJ Supportive & Palliative Care · doi:10.1136/spcare-2025-005743 · Cited by 1
Sohn, M., Yang, J., Lee, J., & Choi, D. (2025) · Alzheimer s Research & Therapy · doi:10.1186/s13195-025-01871-y · Cited by 3
“Prior studies have often been limited by small sample sizes, cross-sectional data, and restricted geographical and cultural contexts [40], constraining the robustness and applicability of findings.”
Wang, Z.-Y., Xin, J.-W., Wang, M., Chen, S., Chen, K., Lu, J., Huang, Y., Zhang, W., Huang, W., Wang, R., et al. (2026) · Neurology · doi:10.1212/wnl.0000000000218184 · Cited by 1
Mapping dementia risk factors and their interactions in Denmark: a nationwide cohort study
Janbek, J., Laursen, T. M., Jørgensen, K., Jensen, M. M., Eliasen, M., Christensen, A. I., Walsh, S., Sommerlad, A., Brayne, C., & Waldemar, G. (2026) · The Lancet Public Health · doi:10.1016/s2468-2667(26)00124-6 · Cited by 1
Nichols, E. L., Kunicki, Z. J., Markot, M., Phillips, D. F., Wilkens, J., Gross, A. L., & Lee, J. (2026) · The Lancet Healthy Longevity · doi:10.1016/j.lanhl.2026.100867 · Cited by 1
“12 Although this evidence on co-occurring risk factors has motivated the development of multidomain intervention trials, such as the Finnish Geriatric Intervention Study to Prevent Cognitive Impairment and Disability (FINGER) and worldwide FINGER trials, 13,14 comparative data on risk factor…”
The Emerging Role of AI in Dementia Research and Healthcare
Ranson, J. M., Bucholc, M., Lyall, D. M., Newby, D., Winchester, L. M., Oxtoby, N. P., Veldsman, M., Rittman, T., Marzi, S. J., Skene, N., et al. (2022) · Brain informatics and health · doi:10.1007/978-981-19-5272-2_4 · Cited by 1
Alnaser, F. A. (2022) · Recent Advances in Clinical Trials · doi:10.33425/2771-9057.1015 · Cited by 1
“Studies show that the presence of one risk factor increases the risk of dementia by 20% and the presence of two risk factors increases the risk by 65% [30].”
BackgroundKaur, D., Bucholc, M., Finn, D. P., Todd, S., Wong‐Lin, K., & McClean, P. L. (2024) · Journal of Alzheimer s Disease · doi:10.3233/jad-230456 · Cited by 2
Atrial Fibrillation and Dementia
Beekman, A. T. F. (2021) · American Journal of Geriatric Psychiatry · doi:10.1016/j.jagp.2021.02.041 · Cited by 1
Zhou, R., Liu, H., Li, F., Yu, J.-R., Yuan, Z., Zheng, J., & Wu, X. (2021) · Research Square · doi:10.21203/rs.3.rs-138882/v1 · Cited by 1
LaPlume, A. A., McKetton, L., Levine, B., Troyer, A. K., & Anderson, N. D. (2021) · doi:10.31234/osf.io/7tzqx · Cited by 1
Simpson, F. M., Johnson, J. D., Kałamała, P., Fabiani, M., Murphy, K. J., Wade, A. T., Harvey, A., Ware, N., Hunter, M., Mellow, M. L., et al. (2026) · medRxiv · doi:10.64898/2026.04.20.26351341 · Cited by 1
Metadata
- Authors
- Peters, R., Booth, A., Rockwood, K., Peters, J., D’Este, C., & Anstey, K. J.
- Affiliations
- UNSW Sydney (AU)
- University of Sheffield (GB)
- Dalhousie University (CA)
- Australian National University (AU)
- Corresponding author
- Peters, Ruth
- Venue
- BMJ Open
- Publisher
- BMJ
- Published
- 2019-01
- Volume
- 9
- Issue
- 1
- Pages
- e022846
- ISSN
- 2044-6055 (ISSN-L)
- PMC
- PMC6352772
- OpenAlex
- W2912629063
- Cited by
- 255
- References
- 135
- Citations by year
- 2026: 32 · 2025: 42 · 2024: 37 · 2023: 32 · 2022: 36 · 2021: 42 · 2020: 30 · 2019: 4
- FWCI
- 4.73
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by-nc
- Locations
- BMJ Open (publishedVersion, cc-by-nc)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
- UNSWorks (UNSW Sydney) (submittedVersion, cc-by-nc-nd)
- ANU Open Research (Australian National University) (submittedVersion, cc-by-nc)
- Spiral (Imperial College London) (submittedVersion, cc-by-nc)
- NOVA (University of Newcastle Australia) (submittedVersion, cc-by-nc)
- Funders
- Dalhousie Medical Research Foundation
- Dalhousie University
- Canadian Institutes of Health Research
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Menopause: Health Impacts and Treatments
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Health and Risk Factors
- Keywords
- dementia risk, cognitive decline, modifiable risk factors, comorbidities, risk factor burden, protective behavior, unhealthy behaviours, dose-response relationship
- MeSH terms
- Dementia, Humans, Risk Factors, Incidence, Cognitive Dysfunction
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