Toasted corn cereal with marshmallow circus shapes. A whole grain food is made by using all three parts of the grain. General Mills guarantees that every box of Big G cereal has at least 8 grams of whole grain per serving (48 grams recommended daily). Exchange: 2 Starch. Exchange calculations based on Choose Your Foods: Exchange List for Diabetes. 2008 the American Dietetic Association, the American Diabetes Association.