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Onions are a source of Fructans are so-called prebiotic fibers, which feed the beneficial bacteria in your gut. Animal studies suggest that onions can lower blood sugar levels. A large observational study in women over 50 years of age found that regular onion consumption is linked to increased bone density . Observational studies have linked increased consumption of onions to a reduced risk of several types of cancers, such as those of the stomach, breast, colon, and prostate . |