コホート研究6件および横断的研究1件の11万4009人を対象に、チョコレート摂取と冠疾患や脳卒中など心代謝障害リスクの関係をシステマティックレビューとメタアナリシスで調査。5件の研究でチョコレートの摂取量と心代謝障害リスク低下との関係が示され、最低摂取群に比べて最高摂取群で心血管疾患リスク37％、脳卒中リスク29％の低下が見られた。
Chocolate consumption and cardiometabolic disorders: systematic review and meta-analysis
Accepted 23 May 2011
Abstract
Objective To evaluate the association of chocolate consumption with the risk of developing cardiometabolic disorders.
Design Systematic review and meta-analysis of randomised controlled trials and observational studies.
Data sources Medline, Embase, Cochrane Library, PubMed, CINAHL, IPA, Web of Science, Scopus, Pascal, reference lists of relevant studies to October 2010, and email contact with authors.
Study selection Randomised trials and cohort, case-control, and cross sectional studies carried out in human adults, in which the association between chocolate consumption and the risk of outcomes related to cardiometabolic disorders were reported.
Data extraction Data were extracted by two independent investigators, and a consensus was reached with the involvement of a third. The primary outcome was cardiometabolic disorders, including cardiovascular disease (coronary heart disease and stroke), diabetes, and metabolic syndrome. A meta-analysis assessed the risk of developing cardiometabolic disorders by comparing the highest and lowest level of chocolate consumption.
Results From 4576 references seven studies met the inclusion criteria (including 114?009 participants). None of the studies was a randomised trial, six were cohort studies, and one a cross sectional study. Large variation was observed between these seven studies for measurement of chocolate consumption, methods, and outcomes evaluated. Five of the seven studies reported a beneficial association between higher levels of chocolate consumption and the risk of cardiometabolic disorders. The highest levels of chocolate consumption were associated with a 37% reduction in cardiovascular disease (relative risk 0.63 (95% confidence interval 0.44 to 0.90)) and a 29% reduction in stroke compared with the lowest levels.
Conclusions Based on observational evidence, levels of chocolate consumption seem to be associated with a substantial reduction in the risk of cardiometabolic disorders. Further experimental studies are required to confirm a potentially beneficial effect of chocolate consumption
文献：Buitrago-Lopez A et al.Chocolate consumption and cardiometabolic disorders: systematic review and meta-analysis.BMJ 2011; 343:d4488.
