The highest concentrations of quercetin are found in berries and onions. Elderberries, of all the berries, are very rich in quercetin, but blueberries—and all other berries—also contain substantial amounts of quercetin. So, while the average American consumes only 20 milligrams of quercetin per day, vegetarians who eat a lot of apples, onions, berries and that sort of thing have been found to get 100 to 200 milligrams daily.
People with high quercetin intake have a 60 percent reduction in lung-cancer death rates. They have a third less incidence of heart disease, and research shows that they have less pancreatic and colon cancer as well.
If people increase their intake of apples, onions and berries, over the long term they should experience lower rates for various types of cancer and heart disease.
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