Diet and Cancer — An Overview

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Abstract
SeleniumSelenium is an essential trace element that has a key role in the activity of glutathione peroxidase, an enzyme that protects against oxidative tissue damage on a cellular level.85 Both internationally5 and within the United States86 geographic areas with low selenium levels in the soil or in pooled blood-bank serum samples generally have higher cancer rates than areas with higher selenium levels. In a study that examined selenium intake in relation to site-specific cancer rates, the strongest inverse correlations were with breast cancer (r = 0.8) and colon cancer (r = 0.7).5 Although these correlational studies are useful for . . .