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Published in: European Journal of Epidemiology 10/2018

Open Access 01-10-2018 | REVIEW

Evaluating Mediterranean diet and risk of chronic disease in cohort studies: an umbrella review of meta-analyses

Authors: Cecilia Galbete, Lukas Schwingshackl, Carolina Schwedhelm, Heiner Boeing, Matthias B. Schulze

Published in: European Journal of Epidemiology | Issue 10/2018

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Abstract

Several meta-analyses have been published summarizing the associations of the Mediterranean diet (MedDiet) with chronic diseases. We evaluated the quality and credibility of evidence from these meta-analyses as well as characterized the different indices used to define MedDiet and re-calculated the associations with the different indices identified. We conducted an umbrella review of meta-analyses on cohort studies evaluating the association of the MedDiet with type 2 diabetes, cardiovascular disease, cancer and cognitive-related diseases. We used the AMSTAR (A MeaSurement Tool to Assess systematic Reviews) checklist to evaluate the methodological quality of the meta-analyses, and the NutriGrade scoring system to evaluate the credibility of evidence. We also identified different indices used to define MedDiet; tests for subgroup differences were performed to compare the associations with the different indices when at least 2 studies were available for different definitions. Fourteen publications were identified and within them 27 meta-analyses which were based on 70 primary studies. Almost all meta-analyses reported inverse associations between MedDiet and risk of chronic disease, but the credibility of evidence was rated low to moderate. Moreover, substantial heterogeneity was observed on the use of the indices assessing adherence to the MedDiet, but two indices were the most used ones [Trichopoulou MedDiet (tMedDiet) and alternative MedDiet (aMedDiet)]. Overall, we observed little difference in risk associations comparing different MedDiet indices in the subgroup meta-analyses. Future prospective cohort studies are advised to use more homogenous definitions of the MedDiet to improve the comparability across meta-analyses.
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Metadata
Title
Evaluating Mediterranean diet and risk of chronic disease in cohort studies: an umbrella review of meta-analyses
Authors
Cecilia Galbete
Lukas Schwingshackl
Carolina Schwedhelm
Heiner Boeing
Matthias B. Schulze
Publication date
01-10-2018
Publisher
Springer Netherlands
Published in
European Journal of Epidemiology / Issue 10/2018
Print ISSN: 0393-2990
Electronic ISSN: 1573-7284
DOI
https://doi.org/10.1007/s10654-018-0427-3

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