"...A. Quercetin is one of a great number (5,000 or more) of water-soluble plant pigments called flavonoids that provide much of the flavor and color in fruits and vegetables..."
"...Tannins will indeed constrict blood vessels, but our 5,000-year history of drinking wine and tea, both of which are high in tannins, is testimony that ill effects are outweighed by benefits. "Proanthocyanidins" are among the substances labeled as "tannins." Proanthocyanidins are simply several molecules of the phytochemicals that we call flavonoids joined together..."
"...But Eric Knight and Stacy Coplin prove that old adage wrong each week when they forage yaupon, the only caffeinated beverage native to North America. Yaupon is a species of holly related to yerba maté and, when the leaves are dried and cold-brewed, it results in a similarly earthy, grassy tea that is naturally high in antioxidants, polyphenols, and anti-inflammatory flavonoids...."
"...This isn't smooth and slippery chocolate like you're used to; it has some texture to it and is completely vegan. And since there's no heat-processing involved, all of the health benefits from the flavonoids and antioxidants are intact...."
"...A diet rich in fruits and leafy green vegetables helps. These are good sources of vitamin A and carotenoids, phytochemicals such as flavonoids, and folic acid, which are all protective against cancer..."
"...Supplements of vitamin E, vitamin C, and a host of other antioxidants have been well documented to reduce this risk. Vitamin E specifically protects DNA from radiation damage, but bear in mind that antioxidants work much better as a team, so adding vitamin C, selenium, flavonoids, and perhaps other antioxidants is well worthwhile..."
"...Red wine contains a class of flavonoids called "oligomeric proanthocyanidins" or, due to this awkward name, OPCs. These are credited with increasing the good HDL cholesterol and may also inhibit the production of a peptide called endothelin-1, which is a potent blood vessel constrictor..."