The cookbook Feed Zone Portables has some great ideas. Depending upon how long I'm planning to hike/run/climb, etc., I try to include as much fresh, whole food as possible. I have to confess, though, that Skratch Labs' matcha green tea & lemon sport chews somehow always find thier way into my pack -- just love 'em!
Marc’s Monsoon Madness Mesquite Cookies.
In Southern Arizona, there are regional annual Mesquite festivals, where folks will bring in their Mesquite Pods to be husked, beans ground and bagged, ready for the kitchen.
Mesquite trees in Southern Arizona are as plentiful as Conifer trees are to the Cascade Mountains.
Besides having a unique nutty flavor, mesquite bean flour is gluten-free, high in calcium, magnesium, potassium, iron, zinc, protein, fiber, and is rich in the amino acid lysine.
@Ammie Sunflower seeds! They are lightweight and packable. The seeds also provide a good way to "pass the time" on the trail over the course of a few hours in between meals. For me, they allow me to take my mind off the more grueling portions of the hike and allow me to really appreciate the environment.
I've always liked banana chips... the potassium of bananas, the crunch of potato chips. And they survive well in my pack!
Also, most of the "healthy" cereals (granolas, etc) work pretty well.