Functional foods are foods with health benefits beyond the basic nutritional content. These foods include fruits, vegetables, many parts of plants and processed foods. Frequent consumption of functional foods is proven to improve health and prevent occurrence of diseases. Many scientific studies have shown that these antioxidants are able to scavenge free radicals and diminish oxidative stress, thus reducing the risk of several diseases. Besides fresh produce, many by-products from the food industry are potential functional foods. This book provides more information about these functional foods as well as nutritional components, health benefits and potential applications for our daily living and the scientific community.