Antioxidant activity, found in hundreds of substances and commonly associated with vitamin A, C, E and many amino acids, protects cellular integrity against oxidative stress, which plays a significant role in many noncommunicable diseases. Oxidation is a natural chemical reaction that occurs during metabolism and produces highly reactive and cell damaging free radicals. Food sources rich in antioxidants include citrus, berries, leafy greens, red beans, sweet potatoes, olive and fish oil, and garlic.

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