Wheat, oats, and barley are whole grains. Buckwheat and quinoa are pseudocereals, which are also whole grains. These complex carbohydrates, some of which are gluten-free, are high in protein and antioxidants, and a one-ounce serving of buckwheat contains 65 mg of magnesium, while one cup of oatmeal contains 226mg (which is about 70% RDI) of magnesium. Whole grains can also lower the chance of heart disease.

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