Spinach can be eaten raw or cooked and is rich in calcium, potassium, iron, and vitamins A, C, and B6. It also offers up many antioxidants that help reduce the harmful effects of free radicals -- molecules that interrupt healthy cell regeneration and can lead to cancerous growths. Spinach is high in oxalates, however, which make absorbing calcium more difficult. Be sure to eat other foods high in calcium to get your full RDI.

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