Carb load. When you're hiking, a majority of your calories should be from complex carbohydrates (like whole grains) to keep your body fueled. Go dried. Dried or dehydrated foods retain most of their nutritional value but are lighter in weight and smaller in volume. Plan your meals. If you're going on a long hike, plan all your meals. Assume you'll have no other source of food. Plan your water needs. If you're going on a long hike, figure out how much water you'll need for the entire trip and make sure you have enough. Stay hydrated. Make sure to bring plenty of water when you go hiking and keep drinking along the hike. Variety. Bring a variety of food to fill your nutritional needs.