Okay, so it looks like I disagree with both you and the low carb nut. You don't need glucose packets. They might help speed you up a bit, but as long as you've

Okay, so it looks like I disagree with both you and the low carb nut. You don't need glucose packets. They might help speed you up a bit, but as long as you've built up your range progressively, the human body can go without them. As I mentioned above, I used to do > marathon distances once or twice a month in the mountains for fun (which I realize is very different than racing. I did dozens if not hundreds of 50k+ runs and have never yet even tried a gel pack. Some of those runs were at a weight of over 90kg! Yes, you'll burn a ton of calories. I often found I weighed in at a full 5kg less after a run and probably 0.5kg less after re-hydrating. Sure, I was never anywhere near as good at long distances as mid distances, but you don't need gel packs. At least I didn't for anything up to 50k, and I probably could have gone further if not for the logistics of carrying enough water and dealing with the heat and humidity that go along with living on a semi-tropical island.