Lifestyle -related diseases, such as arteriosclerosis,which are caused by changes in diet, are becoming a social problem. Intake of antioxidative substances, such as polyphenols and vitamins, effectively eliminate much injury caused by active oxygen. This report deals with the antioxidative activity that has recently been identified in various fruits and vegetables. (1) Polyphenols were shown to possess stronger antioxidative activity than vitamins in some fruits and vegetables. (2) Strong antioxidative activity was specially observed in sprouts (buck wheat) and buds (asparagus). (3) The majority of antioxidative activity decreased rapidly after 96h.