As far as sugar giving you a "boost", I think you will want to have something along to quickly raise your blood glucose if your exercise or medication has dropped it below the desired level. But otherwise you might be better off with getting a "boost" from more protein based food such as nuts, rather than simple carbs. I don't know if you're going to be monitoring your blood glucose, but that would be helpful to determine when you need to have something sweet. If you're not taking meds for the diabetes, your need for sweets would probably be lower in a backpacking situation than if you were taking meds (insulin, glucophage, etc).