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Oxidative Medicine and Cellular Longevity
Volume 2, Issue 5, Pages 270-278
http://dx.doi.org/10.4161/oxim.2.5.9498

Plant Polyphenols as Dietary Antioxidants in Human Health and Disease

Department of Biochemistry, University of Allahabad, Allahabad, India

Received 6 July 2009; Revised 12 July 2009; Accepted 13 July 2009

Copyright © 2009 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polyphenols are secondary metabolites of plants and are generally involved in defense against ultraviolet radiation or aggression by pathogens. In the last decade, there has been much interest in the potential health benefits of dietary plant polyphenols as antioxidant. Epidemiological studies and associated meta-analyses strongly suggest that long term consumption of diets rich in plant polyphenols offer protection against development of cancers, cardiovascular diseases, diabetes, osteoporosis and neurodegenerative diseases. Here we present knowledge about the biological effects of plant polyphenols in the context of relevance to human health.