Here's some info for ya:
POTATOES
The Pontiac with its pink skin, low starch & a GI=80, stands out. The link between starch & GI’s is strong. Harvested before they mature, potatoes are low in starch & GI, later, they have a higher starch & GI.
Potatoes rated lowest to highest:
Ruby Crescent, Russian, Round Red, La Soda, La Touge, Red Norland & Red Pontiac.
Long White. White Rose, Round White, Eastern, California, Canada, Delaware, Irish Cobbler, Katahdin, Kennebec, Long Island, Maine, Superior & Yellow Finn
Russet, Arcadia, Burbank & Idaho.