The heavier your pack, the more energy that will be required to carry it, and the more food that needs to be consumed. Sorta a Catch 22 situation. However 7 pounds of food for 7 days might be cutting it fine. Having said that, I bought some protein powder that provides the equivalent of 5 eggs in one spoonful, Chia seeds that will fill you up in no time, and 32g tree nut spread sachets that contain 837 calories of energy. On the other hand I could eat 30 pounds of lettuce and starve to death. I too don't eat pizza