Regularly updated seafood sustainability pocket reference cards from the Monterey Bay Aquarium. For seafood, they offer nation-wide and region-specific reference cards. For sushi there is a nation-wide reference card.
The glycemic index (GI) is a numerical system of measuring how much of a rise in circulating blood sugar a carbohydrate triggers–the higher the number, the greater the blood sugar response. So a low GI food will cause a small rise, while a high GI food will trigger a dramatic spike. A GI is 70 or more is high, a GI of 56 to 69 inclusive is medium, and a GI of 55 or less is low.
M. McClellan. The New England journal of medicine, 356 (17):
1700-1702(April 2007)PUBM: Print-Electronic; DEP: 20070413; JID: 0255562; 2007/04/13 aheadofprint; ppublish.