Sweet Potatoes are in the peak of their season and are our food of the week. These delicious vegetables are so rich in antioxidants. They have a high concentration of carotenoids, such as beta-carotene (the redder varieties also contain lycopene), as well as vitamin C, all of which act as powerful antioxidants to help combat free radical activity that would otherwise damage cells' internal structures and cell membranes. Additionally, they contain unique root storage proteins that have been observed to have significant antioxidant capacities. In one study, these proteins had about one-third the antioxidant activity of glutathione, one of the body's most potent internally produced antioxidants. Read more, Sweet potatoes.