If you're planning to hike for several days or weeks in a row, you basically have only two options regarding your nutrition: you can either pack a large amount of pre-processed survival-style food products or bring cookware to prepare real hot meals over a gas cooker or campfire. The latter is certainly better for your health, and it can also provide for a nice camping experience, especially if you're hiking with a group of friends or family. Of course, this option depends on having a good camping cook set or a mess kit.