There's no real need to include carbs in snacks or meals just because you use insulin. In fact, smaller carb loads lead to less insulin use. By carb counting instead of using the exchange concept, you match your insulin use to what you're eating - you make your meds match your lifestyle instead of the other way around. I find that my own blood sugar is best managed by eating under 20 grams of carb with meals; I concentrate on protein and fat. Do I still have lots of carbs sometimes? Yes - the Holiday gods will attest to that! But in general I choose non-starchy carbs, avoid most fruits and grains, and enjoy big salads and things like butternut or spaghetti squash or cauli-rice regularly.
Jen