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Free radicals are molecules or portions of molecules that even having one electron less make it extremely reactive. Precisely for the lack of an electron, free radicals are driven to seek a hydrogen atom subtracting in to other molecules, giving rise, thus, to a chain reaction that irreversibly alters the chemical structure of the compounds phones. Acting on the cell membranes of fat and proteins of the nuclear bring serious damages to the cells by destroying membranes and nuclei and at the same time all the components of the cell can be attached. They are formed continuously in the cells of our body, even the white blood cells produce them in order to break down bacteria and viruses. Smoke and radiation find favorable ground and are the basis of aging, cancer, atherosclerosis and hypertension. To combat free radicals the body has antioxidants ( enzymes, vitamins and minerals ) that act offering these free hydrogen and rendering them harmless. Food rich in antioxidants are fruits with black skin, blueberries, plums, strawberries, onions, cabbage, melons, citrus fruit ( polyphenols ) oils, peppers, lettuce, spinach, broccoli ( tocopherols ). Antioxidants help to keep the body in shape by counteracting oxidative processes in the muscles and protect the DNA.