Another important substance in the fight against colorectal and other cancers is the antioxidant. Antioxidants work by bolstering the body's defenses against potentially dangerous substances called free radicals.
Free radicals are one of the by-products of oxygen use by every cell in our body. These substances damage the body's cells through oxidation, the same process that rusts metal and turns butter rancid. Oxidation has also been shown to contribute to heart disease, cataracts, aging, and infections.
The body's cells have a natural defense strategy against free radicals and are often able to repair the damage caused by them. However antioxidants, such as selenium and beta-carotene (a form of vitamin A), help reinforce this protection. Studies have suggested that antioxidants are best taken as foods as opposed to supplements.
Eat foods that are good sources of vitamin A and C, such as all fruits and vegetables, and vitamin E which is found in foods including wheat germ, nuts, and seeds. Good sources of selenium include seafood, meat, and cereals.
Info Source: http://www.webmd.com/diet/guide/eating-good-health
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