Low fat and low calorie is not an option when you go hiking.
I always feel slightly guilty when we go shopping for food for one of our hiking trips, since we're stockpiling on nutty, chocolate-y trail mix, Snickers and PayDay candy bars, and zeroing in on dehydrated milk that's 20% fat. Moderation is not the key during this time.
Rather than carefully regulating our caloric intake, we revel in it. You have to. I can remember times when I did not have enough food while hiking. Your brain develops a curiously keen sense of focus--the opposite of the light-headedness I feel when I've pushed my lunchtime too far. The gaping maw of your stomach is never far from your thoughts. Any food you eat during this time disappears into a black hole and you derive no satisfaction from it, no sense of your body storing anything for fuel. It's like your hunger is a separate entity that won't give your body anything until it's been satisfied.