In their systematic review of the evidence on the effects of eating more fruit and vegetables for primary prevention of cardiovascular disease, Foster and colleagues found no RCTs [1]. They found three systematic reviews of observational cohort studies, all of which found a protective effect against ischemic heart disease.
References
Foster C, Murphy M, Nicholas JJ, Pignone M Bazian Ltd (2005) Primary prevention. Clin Evid 14:1–5.
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