Onions are Full of Nutrients! Egyptians worshiped the onion as far back as 3500 B.C. The onion symbolized eternity, because of its concentric-circle construction. This veggie is filled with layers of health benefits. Onions are rich in powerful sulfuric compounds. They may lower high blood pressure, reduce heart attack risk, and help protect against cancer. One large onion only has 63 calories, is made up of more than one cup of water, and provides up to 20% of your RDA of vitamin C.

Source:  Meredith Stanton, “Onions:  Full of Nutrients” (WebMD)