Quercetin, Substance Found In Fruits And Vegetables, Protects Against Flu
November 26th, 2008
Quercetin, a naturally occurring substance found in fruits and vegetables, can protect against flu, according to a study published by The American Physiological Society. The study also found that stressful exercise increased the susceptibility to the flu, but quercetin canceled out that negative effect.
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 studies, but none of these studies has looked specifically at the flu.
The study was carried out by J. Mark Davis, E.A. Murphy, J.L. McClellan, and M.D. Carmichael, of the University of South Carolina and J.D. Gangemi of Clemson University. The study appears in the current issue of the American Journal of Physiology-Regulatory, Integrative and Comparative Physiology.
The study findings indicate that quercetin could help endurance athletes, soldiers and others undergoing difficult training regimens, as well as people under psychological stress, according to Davis.
“Quercetin was used because of its documented widespread health benefits, which include antiviral activity, abundance in the diet and reported lack of side effects when used as a dietary supplement or food additive,” Davis said.
Earlier studies have found that stressful exercise can increase susceptibility to upper respiratory infections. There was also preliminary information that exercising to fatigue may increase susceptibility to the flu.
The researchers found that:
∑ Stressful exercise increased susceptibility to the flu.
∑ Exercise can cause the flu to develop much sooner than lack of exercise does.
∑ Exercise combined with intake of quercetin results in nearly the same rate of illness as lack of exercise does. In other words, quercetin canceled out the negative effect of stressful exercise.
∑ The severity of the symptoms produced by exercise or exercise combined with intake of quercetin was about the same.
An additional recent study found that people who took quercetin suffered fewer illnesses following three days of exhaustive exercise compared to those who did not take quercetin.
“This is the first study to show a benefit of short-term quercetin intake on susceptibility to respiratory infection following exercise stress,” said Davis. “Quercetin intake was an effective preventive strategy to offset the increase in susceptibility to infection that was associated with stressful exercise.
Acupuncture is a safe and natural therapy which can protect against the flu. For more information call Dr. Richard Browne, Acupuncture Physician, at (305) 595-9500.
One Response to “Quercetin, Substance Found In Fruits And Vegetables, Protects Against Flu”
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