Abstract
Purpose
Increasing vegetable intake and diversity are recommended to maintain better health. Evidence for the health benefits of vegetable diversity, separate from total intake, is scarce. We aimed to investigate the associations of vegetable diversity with subclinical measures of atherosclerosis and atherosclerotic vascular disease (ASVD) mortality.
Methods
Vegetable diversity was assessed within a validated food frequency questionnaire using a single question, ‘How many different vegetables do you usually consume each day (< 1 to ≥ 6 per day)’. Cox proportional hazards modelling was used to examine the association between vegetable diversity and ASVD mortality in 1226 women aged ≥ 70 years without clinical ASVD or diabetes mellitus at baseline (1998). In 2001, B-mode ultrasonography was used to measure common carotid artery intima–media thickness (CCA-IMT) (n = 954) and carotid plaque severity (n = 968).
Results
Over 15 years (15,947 person-years) of follow-up, 238 ASVD-related deaths were recorded. For each additional different vegetable consumed per day, there was 17% lower hazard for ASVD mortality (HR = 0.83, 95% CI 0.78, 0.93, P = 0.001); a 1.7% lower mean CCA-IMT (B ± SE: − 0.013 ± 0.004, P < 0.001); and a 1.8% lower maximum CCA-IMT (B ± SE: − 0.017 ± 0.004, P < 0.001). Further adjustment for total vegetable intake attenuated the association between vegetable diversity and ASVD mortality (P = 0.114), but not CCA-IMT (P = 0.024). No association was observed between vegetable diversity and carotid plaque severity (P > 0.05).
Conclusions
Vegetable diversity may contribute to benefits in lowering risk of ASVD in older women. The reduction in risk is partly explained by increased total vegetable consumption.
Clinical trial registry
The Perth Longitudinal Study of Aging in Women (PLSAW) trial registration ID is ACTRN12617000640303. This study was retrospectively registered on the Australian New Zealand Clinical Trials Registry at http://www.anzctr.org.au.
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Abbreviations
- ASVD:
-
Atherosclerotic vascular disease
- CCA-IMT:
-
Common carotid artery intima–media thickness
- CKD-EPI:
-
Chronic Kidney Disease Epidemiology Collaboration
- eGFR:
-
Estimated glomerular filtration rate
- FRS:
-
Framingham risk scores
- HDL:
-
High-density lipoprotein
- ICD:
-
International Classification of Diseases
- ICPC-Plus:
-
International Classification of Primary Care-Plus
- LDL:
-
Low-density lipoprotein
- NRVs:
-
Nutrient reference values
- PLSAW:
-
Perth Longitudinal Study of Aging in Women
- WADLS:
-
Western Australian Data Linkage System (WADLS).
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Acknowledgements
The authors wish to thank the staff at the Western Australian Data Linkage Branch; Hospital Morbidity Data Collection; Registry of Births, Deaths and Marriages; Victorian Department of Justice and Regulation; and the National Coronial Information System for their work on providing the data for this study.
Funding
The Perth Longitudinal Study of Aging in Women (PLSAW) study was funded by Healthway the Western Australian Health Promotion Foundation and by Project Grants 254627, 303169, and 572604 from the National Health and Medical Research Council (NHMRC) of Australia. The analysis was supported by an NHMRC of Australia Project Grant 1084922. NHMRC of Australia Fellowships supported the salaries of JRL and JMH. None of these funding agencies had any role in the conduct of the study; collection, management, analysis, or interpretation of the data; or the preparation, review or approval of the manuscript.
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LCB, JRL, MS, AD, RLP, and JMH: study concept and design; JRL, AD, KZ, WHL, PLT, and RLP: acquisition of data; LCB, RJW, and JMH: statistical analysis and interpretation of data; LCB: drafting of the manuscript; and all authors: critical revision of the manuscript for important intellectual content.
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Blekkenhorst, L.C., Lewis, J.R., Bondonno, C.P. et al. Vegetable diversity in relation with subclinical atherosclerosis and 15-year atherosclerotic vascular disease deaths in older adult women. Eur J Nutr 59, 217–230 (2020). https://doi.org/10.1007/s00394-019-01902-z
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DOI: https://doi.org/10.1007/s00394-019-01902-z