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An increased consumption of flavonoid-rich cocoa and soy isolated protein may decrease blood pressure and improve heart health, and drinking Green Tea improves cholesterol but other flavonoids in food sources are not as effective, according to a new meta-analysis. There is a wealth of studies reporting beneficial effects for the compounds from chocolate, soy and tea reports lead author Lee Hooper from the University of East Anglia in the United Kingdom.
Hooper and co-workers included 133 trials in their meta-analysis. A vast body of epidemiological studies has linked increased dietary intake of antioxidants from fruits, vegetables wine, chocolate, coffee, tea, and other foods to reduced risks of a range of diseases including cancer, cardiovascular disease and diabetes.
Flavonoids can be split into a number of sub-classes, including anthocyanins found in berries, flavonols from a variety of fruit and vegetables, flavones from parsley and thyme, for example, flavanones from citrus, isoflavones from soy, mono- and poly-meric flavonols like the catechins in tea, and proanthocyanidins from berries, wine and chocolate. The non-flavonoids include phenolic acids, lignans, and Stilbenes such as Resveratrol. It is important to note that standardized extracts were not examined in this study, in other words the amount of OPCs in a Grape Seed capsule could not be matched by eating grapes so benefits of isolated supplements are not part of this analysis.