Processed foods are often perceived as having negative attributes, including lim ited nutritional value, high calorie con- tent, increased glycemic index, and ex- cessive amounts of sugar, salt, chemical preservatives, and/or oil. Extrusion is a technology that is widely used for pro- cessing ready-to-eat snack and breakfast cereal products. This article describes a viable avenue for improving the nutri- tional profile of extruded foods by deliv- ering both fiber and antioxidants through incorporation of fruit and vegetable by- products. In the samples tested, extrusion led to a decrease in the concentration of antioxidants(phenolic compounds and carotenoids) in expanded products con- taining apple and tomato pomaces. How- ever, the free-radical scavenging capacity(antioxidant activity) increased due to processing, underscoring the potential health benefits of incorporating these in- gredients. These positive aspects need to be investigated further, including the mechanism of antioxidant activity enhancement. This is part of ongoing investigations by our resreach group.