The aim of this review, a summary of the putative biological actions of fla
vonoids, was to obtain a further understanding of the reported beneficial h
ealth effects of these substances. Flavonoids occur naturally in fruit, veg
etables, and beverages such as tea and wine. Research in the field of flavo
noids has increased since the discovery of the French paradox, ie, the low
cardiovascular mortality rate observed in Mediterranean populations in asso
ciation with red wine consumption and a high saturated fat intake. Several
other potential beneficial properties of flavonoids have since been ascerta
ined. We review the different groups of known flavonoids, the probable mech
anisms by which they act, and the potential clinical applications of these
fascinating natural substances.