Energy bars primarily consist of quick digesting carbohydrates. The high carb content provides a quick burst of energy, while a smaller amount of protein helps fuel the muscles and keep the body healthy. Sports energy bars provide fuel for the muscles before, during or after exercise for enhanced performance. Other types of energy bars are made for people who need energy, but don’t have time to eat a meal. These products are typically low in fat, which makes them easier and quicker to digest. This allows the body to break down and absorb the carbohydrates quickly and to provide the energy it needs.