Loath as we are to consider food as simply fuel, hitting the trail with a pack full of nourishing snacks will help keep you on track.
What to Pack
During moderately strenuous exercise, your body needs a combination of fat, protein and carbohydrates (plus about 8 ounces of water every 20 minutes) to stay energized. For short hikes, pack trail mix, fruit, hard candy and crackers, and nibble as you go. For longer hikes, add a substantial lunch, such as sandwiches, cheese and crackers, and fruit, and eat when you start to feel hungry.