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Popcorn is actually pretty decent Carb-wise. As for Glycemic Index:

Code:


Glycemic Index

Microwave Popcorn (1.5 cups): 55 - 89
Whole Wheat Bread (1 slice):  52 - 78
White Bread       (1 slice):  69 - 80 (Wonder Bread = 73)

Glycemic Load

Microwave Popcorn (1.5 cups): 3.5 - 5.7
Whole Wheat Bread (1 slice):  5.9 - 8.9
White Bread       (1 slice):  9.3 - 9.8 (Wonder Bread = 9.8*)

Net Carbs

Popcorn           (1.5 cups):  7g
Whole Wheat Bread (1 slice):  11g
White Bread       (1 slice):  13g

*I calculated Wonder Bread using its GI and the Carb Count for a slice of standard slice of White Bread.

Clearly, Popcorn is superior across the board to Whole Wheat Bread. Its lower in Carbs, about the same GI, and lower GL. Since, both Bread and Popcorn need something to make them taste good [as they generally don't on their own,] whatever you add will effect these numbers. Topping (Butter, Oil, and Peanut Butter) will usually lower the GI and GL. The GI Database doesn't have any information on mixing Popcorn with other foods, BUT:

Code:


White Bread Taken with -- 

200mg Acarbose Alpha-Amylase Inhibitor:     18
200mg Acarbose Alpha-Glucosidase Inhibitor: 50
  6mg Trestatin Alpha-Amylase Inhibitor:    29
  3mg Trestatin Alpha-Amylase Inhibitor:    48
----------------------------------------------------
Butter, Yogurt, and a Pickle:               39
15g Psyllium Fiber:                         41 - 65*
Vinegar:                                    45
Powdered Seaweed:                           48
Butter, Cheese, Whole Milk, and a Cucumber: 55
Skim Milk Cheese:                           55
Butter:                                     59
Butter + Skim Milk Cheese:                  62
Peanut Butter (Part Whole Wheat):           67
NOTHING:                                    69 - 80

*That 65 was one study, so it may have been in error. Especially, considering the rest of the numbers were pretty much all lower