ORAC stands for oxygen radical absorbance capacity, a measure of the ability of a food or any other substance to quench oxygen free radicals in a test tube. Free radicals are unstable atoms or molecules generated in the course of normal metabolism that can strip electrons from other molecules, causing chain reactions of oxidative damage. Cumulative damage of this sort probably accounts for many of the degenerative changes of aging and for a lot of age-related disease.
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