Every formula that I have found shows that a guy my size, 160 pounds, burns about 425 calories an hour of hiking. I think this might be on the low end since I'm hiking tough terrain and also have my 40-50 pound pack on... after thinking about it, no wonder I get so hungry!! I make it a point to drink plenty of fluids but I can only eat so many protein bars and candy while hiking around for 8-10 hours. What snacks do you guys pack to make sure you're getting enough calories and not becoming hypoglycemic or digging a caloric deficit? Any ideas other than the protein bars, jerky, snickers/payday, mountain house?