This document discusses various functional foods and their health benefits. It begins by defining functional foods as foods that provide health benefits beyond basic nutrition. The history of functional foods is then summarized, noting that Japan first established a definition for these foods in 1991. Several categories of functional foods are then listed, including those fortified with vitamins/minerals, containing cholesterol-reducing components, and probiotics/prebiotics. Specific examples like yogurt, fruits and vegetables are given. Methods for how foods can become functional are outlined, such as by adding or increasing beneficial components. The roles and health benefits of various functional food categories are then summarized in 1-2 sentences each, including dairy products like milk and yogurt, seafood rich in omega