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British Medical Bulletin 49:679-699 (1993)
© 1993 The British Council
research-article |
Prospects for the prevention of free radical disease, regarding cancer and cardiovascular disease
Vitamin Unit, Institute of Biochemistry and Molecular Biology, University of Berne Berne, Switzerland
Abstract
Free radicals may be involved in the aetiology of cancer and cardiovascular diseases. In epidemiological studies poor plasma levels of all essential antioxidants are associated with increased relative risks; in particular, low levels of carotene and vitamin E with the risk of cancer and ischemic heart disease, respectively. The studies suggest that for optimal synergistic protection the plasma antioxidant levels should simultaneously exceed the threshold values of 28–30 µmol/l lipid-standardized vitamin E, 40–50 µmol/l vitamin C, 0.4–0.5 (µmol/l carotene and 2.2–2.8 µmol/l lipid-standardized vitamin A. However the preventive efficacy of an optional antioxidant status is still to be proven in randomized intervention trials. Although these antioxidant micronutrients may be the primary protective components of vegetable-rich ‘preventive’ diets, the potentials of other plant components await exploration, eg carotenoids other than ß-carotene, bioflavonoids and oxygen-sensitive B-vitamins.
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