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Free radicals and antioxidants in health and disease PowerPoint Presentation

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Slide 1 - Free radicals and antioxidants in health and disease
Slide 2 - Introduction The free radical diseases Counteracting free radical damage Antioxidants
Slide 3 - Introduction The destructive effects of free radicals on proteins may play a role in the causation of cataracts. Free radical damage to DNA is implicated in the causation of cancer and its effect is very likely responsible for heart disease. The free radicals theory of the aging process
Slide 4 - Can we eliminate overall free radicals from human body? Free radicals also serve useful purposes in the human body. the complete elimination of these radicals would not only be impossible, but also harmful.
Slide 5 - The free radical diseases Cancer and atherosclerosis, two major causes of death,are salient " free radical" diseases.
Slide 6 - The free radical diseases Cancer initiation and promotion is associated with chromosomal defects and oncogene activation. It is possible that endogenous free radical reactions, like those initiated by ionizing radiation, may result in tumour formation.
Slide 7 - The free radical diseases Atherosclerosis may be due to free radical reactions involving diet-derived lipids in the arterial wall and serum to yield peroxides and other substances. These compounds induce endothelial cell injury and produce changes in the arterial walls .
Slide 8 - Counteracting free radical damage The human body has several mechanisms to counteract damage by free radicals and other reactive oxygen species.
Slide 9 - Counteracting free radical damage One important line of defence against free radical damage is the presence of antioxidants. Some such antioxidants, are produced during normal metabolism in the body. Other lighter antioxidants are found in the diet.
Slide 10 - Antioxidants vitamin E vitamin C carotenoids
Slide 11 - vitamin E Vitamin E is a fat-soluble substance present in all cellular membranes and is mainly stored in adipose tissue, the liver and muscle. Vitamin E is a principal antioxidant in the body and protects polyunsaturated fatty acids in cell membranes from peroxidation.
Slide 12 - Vitamin E and cancer Besides being a free radical scavenger, vitamin E at high intakes enhances the body's immune responses. Vitamin E also inhibits the conversion of nitrites in the stomach to nitrosamines, which are cancer promoters.
Slide 13 - Vitamin E and cardiovascular disease Vitamin E intakes are associated with lowered risk of angina and mortality from heart disease.
Slide 14 - Vitamin E and neurological disorders Supplementation with vitamin C and E might be of benefit in slowing the progression of Parkinson's disease.
Slide 15 - Vitamin C Vitamin C, or ascorbic acid, is a water-soluble vitamin. This vitamin is a free radical scavenger, it is considered to be one of the most important antioxidants in extra cellular fluids. Its protective effects extend to cancer, coronary artery disease, arthritis and aging.
Slide 16 - Vitamin C and cancer Vitamin C is effective in protecting tissues against oxidative damage. It suppresses the formation of carcinogens. Numerous studies have reported the protective effect of fruit and vegetable consumption on incidence of cancer . This is mainly attributed to the protective effect of vitamin C against cancer.
Slide 17 - Vitamin C and cardiovascular disease Vitamin C may lower total cholesterol in the blood, thus reducing the risk of cardiovascular disease. Coronary heart disease mortality is higher in those with blood vitamin C levels that are near or in the deficient range.
Slide 18 - Vitamin C and cataracts High intake of fruits and vegetables which are rich sources of ascorbic acid appear to be protective too. In several studies, cataract patients were shown to have low vitamin C and E intakes and low plasma vitamin C levels.
Slide 19 - Carotenoids Carotenoids are a group of red, orange and yellow pigments found in plant foods, particularly fruits and vegetables. Some carotenoids like b-carotene act as a precursor of vitamin A; others do not.
Slide 20 - Thanks 4 ur attention!
 

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