Hi,
It is quite hard to resist to snack or grab something out the cupboard when your used to eating whenever you like, without thinking about insulin injections or testing your BG.
As for snacks are you referring to snacking before and exercise or in general?
If your snacking before exercise you could have something that does contain carbohydrates as you may find the exercise will compensate for the rise in blood glucose. Same applies for after exercise as exercise will affect your body for a while after, especially if it's strenuous exercise.
Be aware though exercise CAN make your BG's rise though, this is dependant on the person and what type of exercise your doing.
I find that quick bursts of exercise, particularly something that gets your heart rate going, will push my BG's up, they eventually come back down, so i tend not to snack before exercise if this is the case..
If its something like walking or football for longer than 30 mins, it tends to make my BG's drop, so i have a snack before hand, half a sandwich or a banana. With football it tends to be glucose tablets before i start and in half time.
If you want something carb free you could have something like carrot sticks or cucumber, i tend to eat these with dips.
Check out the recipes part of the forum, you may find some good ideas there.