RS1 The starch is physically inaccessible
to digestion due to intact cell walls,
e.g. grains
RS2 Native starch granules protected
from digestion by the structure of
the starch granule
RS3 Retrograded starch – e.g. cooked
then cooled potato, rice or pasta;
RS3 forms as it cools
RS4 Chemically modified starches – do
not occur naturally but are created
to be resistant to digestion