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Antioxidants is the name of the groups which has the anti-oxidative by preventing free-radical, for example: - Vitamin A - Vitamin C (ascorbic acid) - Vitamin E (mostly alpha-tocopherol) - Carotenoids (mostly beta-carotene) - Anthocyanins - Catechins - Lutein - Lycopene - Selenium - Manganese - Ellagic acid - Resveratrol - Zeaxanthin - ... Antioxidants are present in large amounts in several foods. However, the actual amount of antioxidants in several plant products may differ due to several factors. These include: - soil type and chemistry - available nitrogen and levels of other plant nutrients - moisture levels - temperature - pests It has been seen that plants which are exposed to stress are driven to synthesize antioxidants and are richer in these polyphenols and flavonoids. Food rich in antioxidants are shown here: To protect the cells and organ systems of the body against reactive oxygen species, humans have evolved a highly sophisticated and complex antioxidant protection syste

All living organisms utilize oxygen to metabolize and use the dietary nutrients in order to produce energy for survival. Oxygen thus is a vital component for a living. Oxygen meditates chemical reactions that metabolize fats, proteins, and carbohydrates to produce energy. 1. OXYGEN AND FREE-RADICALS a) Dark side of oxygen While oxygen is one of the most essential components for the living, it is also a double-edged sword. Oxygen is a highly reactive atom that is capable of becoming part of potentially damaging molecules commonly called “free radicals.” b) Free radicals These free radicals are capable of attacking the healthy cells of the body. This may lead to damage, disease and severe disorders. Cell damage caused by free radicals appears to be a major contributor to aging and diseases like: - cancer - heart disease - the decline in brain function - the decline in immune system etc. Overall, free radicals have been implicated in the pathogenesis of at least 50 diseases. Since free ra