Complex carbohydrates and whole grains are essential for a healthy, balanced diet. A one-cup serving of gluten-free cooked quinoa provides 2.76 milligrams of iron. Quinoa contains good amounts of magnesium and copper and antioxidants to guard cells against harmful free radicals. These bad cells attack healthy cells and interrupt the regeneration of new cells, facilitating the development of cancer. This ancient grain is also one of the only plant foods that is a complete protein -- it contains all nine essential amino acids.

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