Somewhere in with all your gear you also have to carry enough nourishment and energy for the time you are out in the woods. More than likely you will be cooking on one of the micro cooking stoves that are on the market. These consist of one burner and primarily fulfill the purpose of boiling water. Most of your food will be of the dehydrated variety so the stove is perfect for this. There are many cereals on the market that are light in weight.
Cheerios are healthy and light.
Pre-packaged hot cereals, like oatmeal and Cream of Wheat work really well. If you are really interested in also reducing paper containers and keeping the price of your groceries down, buying the cereal in bulk, measuring out each days' portion and mixing in dried milk and sugar in proportion and repackaging in Zip-Loc bags works very well. You can also mix in dried fruits such as raisins, dried cranberries or blueberries or what ever fruit works for you. When you add the boiling water to the warm cereals, the fruit will re-hydrate. Of course, with the cold cereals such as the Cheerios, you will use cold water with the powdered milk.