Because the different types of resistant starch differ in
their composition and structure, the effects of processing
on each type of resistant starch need to be considered individually. With RSI, digestive enzymes are unable to hydrolyze the starch because of an inability to penetrate the cell
wall materials. Therefore, grinding or homogenization of
the grains can break down the cell structures and decrease
the resistant starch content. RSII is found in raw starchy
foods, and the resistant starch content would be expected to
decrease during processing that results in starch gelatinization. On the other hand, RSIII is formed when starches gelatinize and recrystallize, thus resistant starch contents could
increase when those foods received further heat treatment (7).