Quercetin, a close chemical relative of resveratrol, is present in a variety of fruits and vegetables, including red onions, grapes, blueberries, tea, broccoli and red wine. It has been shown to have anti-viral properties in cell culture experiments and some animal studies, but none of these studies has looked specifically at the flu.
“If quercetin provides a similar benefit for humans, it could help endurance athletes, soldiers and others undergoing difficult training regimens, as well as people under psychological stress,” study researcher J. Mark Davis. In fact, a recent human study found that people who took quercetin suffered fewer illnesses following three days of exhaustive exercise compared to those who did not.
Substance found in fruits and vegetables reduces likelihood of the flu
Source: American Physiological Society
