additives are fun
i discussed this in this post :
http://boards.elitefitness.com/forum/showthread.php?postid=2718678#post2718678
basically, dextrose and maltodextrin are low-density sweeteners.... a tablespoon of dextrose has about half the calories of a tablespoon of sucrose, and about 3/4 tablespoon of maltodextrin has the calories of sucrose....
this is useful when you need fillers (a common additive in food, food additiive science is fun)...
if you didn't add the filler, you'd have a pinch of sweetener so small, that accurate dosing would be nearly impossible.... if you ever saw the sweetening pills they also sell, even those have dextrose because the actual sweetener is much too minute to be useful in its pure form.....
also, most sweeteners have an aftertaste because of the fact they don't react exactly as the "fermentable/naturally occuring" sugars... adding natural sweeteners blunts this effect dramatically
also, although sweeteners with calories (dextrose. maltodextrin) are used, the amount is only of consequence if you use 10 or more packets... this is roughly what it would take to make a teaspoon of dextrose, and then, you would get about 8-10 calories....... so in essence, each packet provides about 0.8 calories of caloric value..... and 0.8 kilocalories (same word, but i like it) of carbohydrate value.....
and the FDA is ok with rounding down....