Onions are superfoods as they contain one of the highest concentrations of quercetin, a type of flavonoid. The research team claims that onions grown in Ontario have higher concentrations of quercetin when compared to some parts of the world. Red onions may be effective in killing cancer cells, finds a new study. A research team tested five types of onion grown in Ontario and discovered that Ruby Ring onion variety has cancer-fighting properties.
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