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Nutr Rev. 2019 Oct 1;77(10):691-709. doi: 10.1093/nutrit/nuz042.

Nut consumption and incidence of cardiovascular diseases and cardiovascular disease mortality: a meta-analysis of prospective cohort studies.

Author information

1
Human Nutrition Unit, Department of Biochemistry and Biotechnology, Universitat Rovira i Virgili, Reus, Spain; the Nutrition Unit, University Hospital of Sant Joan de Reus, Reus, Spain; and the Institut d'Investigació Sanitària Pere Virgili (IISPV), Reus, Spain.
2
Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Institute of Health Carlos III, Madrid, Spain.
3
Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada; and the Toronto 3D Knowledge Synthesis and Clinical Trials Unit, Clinical Nutrition and Risk Factor Modification Centre, St. Michael's Hospital, Toronto, Ontario, Canada.
4
College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
5
Institute for Clinical and Experimental Medicine, Prague, Czech Republic; and the Physicians Committee for Responsible Medicine, Washington, District of Columbia, USA.
6
Vuk Vrhovac University Clinic for Diabetes, Endocrinology and Metabolic Diseases, Merkur University Hospital, Zagreb, Croatia; and the School of Medicine, University of Zagreb, Zagreb, Croatia.
7
Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada. John L. Sievenpiper is with the Division of Endocrinology and Metabolism, Department of Medicine, St. Michael's Hospital, Toronto, Ontario, Canada.

Abstract

CONTEXT:

Previous meta-analyses evaluating the association between nut consumption and the risk of cardiovascular disease (CVD) had substantial methodological limitations and lacked recently published large prospective studies; hence, making an updated meta-analysis highly desirable.

OBJECTIVE:

To update the clinical guidelines for nutrition therapy in relation to the European Association for the Study of Diabetes (EASD), a systematic review and meta-analysis of prospective studies was conducted using the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) system to summarize the evidence of the association between total nuts, specific types of nuts, and the incidence of, and mortality from, CVD outcomes.

DATA SOURCES:

Relevant articles were identified by searching the PubMed and Cochrane databases.

DATA EXTRACTION:

Two independent researchers screened the articles to identify those that met the inclusion criteria.

DATA ANALYSIS:

The inverse variance method with fixed-effect or random-effects models was used to pool data across studies (expressed as risk ratio [RR] and 95% confidence interval [CI]). Heterogeneity was tested and quantified using the Cochrane Q test and I2-statistic, respectively. The GRADE system was used to assess the quality of the evidence.

RESULTS:

Nineteen studies were included in the analyses. The results revealed an inverse association between total nut consumption (comparing highest vs lowest categories) and CVD incidence (RR, 0.85; 95%CI, 0.800.91; I2, 0%), CVD mortality (RR, 0.77; 95%CI, 0.72-0.82; I2, 3%), coronary heart disease (CHD) incidence (RR, 0.82; 95%CI, 0.69-0.96; I2, 74%), CHD mortality (RR, 0.76; 95%CI, 0.67-0.86; I2, 46%), stroke mortality (RR, 0.83; 95%CI, 0.75-0.93; I2, 0%), and atrial fibrillation (RR, 0.85; 95%CI, 0.73-0.99; I2, 0%). No association was observed with stroke incidence and heart failure. The certainty of the evidence ranged from moderate to very low.

CONCLUSIONS:

This systematic review and meta-analysis revealed a beneficial role of nut consumption in reducing the incidence of, and mortality from, different CVD outcomes.

KEYWORDS:

cardiovascular disease; meta-analysis; nuts; peanut butter; peanuts; tree nuts; walnuts

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