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Free Radicals Free radicals are highly reactive molecules in the body which can destroy tissues by oxidizing cell membrane lipids and damaging DNA, the body's genetic material. Free redicals are produced through the body's normal process of metabolizing the air we breath and the food we eat, as well as exposure to tabacco smoke, excess sunlight and environmental pollutants. Antioxidants work in the body by neutralizing free radicals before the can do significant harm. Back to Glossary of Fitness Index.

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