"I'll also add that running out of food on a long expedition can be a profoundly GOOD experience. I've done it plenty of times with young students, and they end up learning a great deal about themselves. I don't advocate it, but it CAN be very rewarding."
Yeah, I understand.
Actually, I am diabetic. Running out of food can be very bad... I slow down to about half my pace and have a lot of trouble concentrating...even setting up the tarp is a chore if my blood sugar is down in the 40's. Like you say, Mike, I always bring a reserve of candy specific to me and the diabetes. Not everyone has it, soo, I do not list it, nor normally mention it. This is simply to bump up my blood sugar when I get too low. It is only about 600Calories, but fast acting and will not last long.
If you have diabetes, you already know to check, unless you can feel it. Use simple common sense and prepare for this and allow for the extra exertion. High or Low blood sugar is bad. Make sure you know what the score is. Where is the help when you need it? On the trail, probably not there. If you don't keep track, you could end up in a world of hurt. You are responsible for keeping your body going. This goes double if you have diabetes. Quadruple if you are out solo.