Resistant starch (RS) is not digested allowing fermentation in the colon, so it can be considered a kind of dietary fiber. Four types of RS have been described: RS1, that is physically inaccessible to digestion such as in grains or seeds; RS2, which its granules are structured in a way that does not allow enzymes to hydrolyze it; RS3 is the retrograded starch formed when foods are cooked and cooled; RS4 is a chemically-modified starch