These substances are also generated by factors like cigarette smoke and polluted air. In nature the process of oxidation causes metal to rust, or fruit to turn brown. In our body free-radicals have a damaging effect on our cells that may increase the risk of certain cancers as well as promote the development of coronary artery disease. Antioxidants like vitamins C and E, carotenoids and the mineral selenium in particular seem to be able to limit the effects of free-radicals. Vitamin C is readily available from citrus fruits and juices, bell peppers, broccoli, hot chili peppers, green leafy vegetables, tomatoes and potatoes.
Deficiencies typically develop in the elderly, alcoholics, cancer patients, and some food faddists.
It is found mainly in vegetable oils, sweet potatoes, avocados, nuts, sunflower seeds, soybeans and the fatty portion of meats. It is important to note that not all vitamin E is the same. The body utilizes the natural form much more efficiently and is the preferred form for supplementation. Carotenoids are nutrients found typically in bright yellow and orange vegetables and fruits. There are several hundred naturally occurring carotenoids available through dietary sources.