by Orion » Fri 11 Sep, 2015 11:22 am
I don't think there's any magic. Once you reduce moisture, fiber and packaging weight as much as you can the only other options are to increase fat content. Or consider ethanol, in moderation of course. In high concentration (think barrel strength as a minimum) it has a reasonably high mass calorie density.
The big question that nobody can answer is what you need. You may not even be able to figure this out for yourself as it will probably vary significantly from trip to trip as your body changes and as specific trip demands change. I've got a ballpark value for myself. It's around 3500 kcal (15000 kJ) per day. It only works for 1-2 weeks for me on "typical" trips, then I get hungry. But some people have more efficient metabolisms and/or more on board fat to burn. They can do with less.
In terms of weight, with mostly dry 40% fat content food I carry about 700-750g per day. For 1-2 weeks max.
It's not very useful information though, not without knowing age, gender, mass, body composition, typical pack weight and miles per day or some other metric of difficulty.