what is rs medical definition?
Resistant starch Starches with high amylose content generally have increased resistant starch. Definition and categorization. Resistant starch (RS) is any starch or starch digestion products that are not digested and absorbed in the stomach or small intestine and pass on to the large intestine. RS has been categorized into four types: 1  RS1 â Physically inaccessible or undigestible resistant starch, such as that found in seeds or legumes and unprocessed whole grains. 2  RS2 â Resistant starch is inaccessible to enzymes due to starch conformation, as in high amylose corn starch.