Hi Lorraine-
I asked a similar question a few months ago when I found that pumpkin seeds were a fairly low carb salty snack. The opinion of a few people on the board was that the shell/hull would be all fiber and therefore deducted from any carb count because it is not digestible (at least that was my understanding of their answers). I eat them on a pretty regular basis and find them to be a really good munching snack. I think you can go ahead and enjoy!
Karen
p.s. I also eat them with the shell on. At first I tried getting them out of the shell but it's much harder than shelling a sunflower seed and I kind of like them with the hull anyway...