Kale, another dark, leafy green, is a rich source of vitamins A, K, and C, but its health perks don't stop there. Kale is an extremely nutrient-dense food, with one cup containing more than 200% the RDI of vitamin A, nine percent of your daily calcium and potassium, and two grams of protein. The minimal fat content is largely omega-3 fatty acids, which are essential to good health.

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