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Studies prove that onion contains components capable of reducing the risk of tumors of the intestine, stomach and prostate, and acts against bacteria that cause cavities. For this effectiveness, it is necessary to eat two onions a week.There are three types of onions, the white ones, with a stronger flavor, the yellow ones, which in turn are the most consumed in Brazil, and the purple ones, chosen as preferred in many communities, for having a milder flavor.