Amazing, how if I hold off long enough, someone will ask the same question I've been wondering!
I rember as a kid, we used to have this giant camper to travel in. since it was only the second car, my dad would take the smaller car to work, leaving my mom this great big truck and camper combo for errands to run. Anyway, I remember a few occasions, I'd get soooo hungry, I'd look for ANYTHING to eat, and remember finding pure suguar and eating that! Not that I liked it, I was in need of anything (I must've been at least 10), but even after that, there were occasions that I'd shake, most was after doing something exhaustive like cleaning for several hours, or, even having too much coffee and nothing more than simple sugars with it.
I asked my doctor who's quite familiar with diabetes to test me, he found nothing. I figured it may have to do with how fast we CF'rs must burn up calories.
I usually will grab a candy bar, or some high sugar content food to get back up, again. But, I also try and keep in mind some of the symptoms regarding diabetes, which is drinking a lot of fluids, frequent urinating; how often, and possibly under what circumstances my blood sugar level drops. (I'm sure there are even more symptoms, this is just to list a few I know)
Since my family has a history of diabetes, and there are a lot of CF related cases with diabetes, I try to stay aware of the possibilities. Worst case scenario--no insulin shots--still hate needles!