The process is called oxidation and the substance produced is called "free radicals." Because of their highly unstable nature, free radicals increase damage to cells of the body, thus contributing to the aging process. In order to neutralize these free radicals, your body uses certain vitamins, minerals, and enzymes - collectively known as antioxidant antiaging. The Top 20 list includes small red beans (dried), wild blueberry, red kidney beans, pinto beans, blueberry (cultivated), cranberry, artichokes (cooked), blackberry, prunes (dried plums), raspberry, strawberry, red delicious apples, Granny Smith apples, pecans, sweet cherries, black plums, russet potatoes (cooked), black beans (dried), plums, and gala apples. Tomatoes, broccoli, cauliflower, peppers - these are but a few of the many antioxidant foods out there. However, you should note that not all vegetables are high sources of antioxidant foods. Some vegetables or fruits may have lesser amount or concentration of antioxidant foods as other vegetables. For instance, white grapes don't have the same amount of antioxidant foods as the grapes used in making red wine. Aging is caused by harmful molecules called "free radicals." This was according to Denham Harman, M.D., Ph.D., who first proposed the theory in the 1950s. Since then, scientists and researchers have sought to understand the body's oxidation process and free radicals contribute in its acceleration. By reducing exposure to free radicals and increasing the intake of antioxidant enzyme rich foods or antioxidant enzyme supplements, your body's potential to reducing the risk of free radical-related health problems is made more palpable. The human body produces several types of antioxidant enzymes. The antioxidant enzymes include superoxide dismutase (SOD), catalase, and glutathione peroxidase. Berries are full of fibers, minerals and vitamins. They are also loaded with healing antioxidants, which of course make them excellent antioxidant foods. There are several kinds of berries, as you well know, and each kind has a different concentration of antioxidants. In recent studies, purple berries (such as Elderberry and black currant) are considered as the richest antioxidant foods.