Energy bars are fortified foods containing a blend of protein, carbohydrates, fat, fiber, vitamins, minerals, and other nutrients. The primary source of protein in energy bars is usually soy or milk, with fiber provided from grains, oats, apple pectin, or other sources. Some bars also contain additional herbs or nutrients thought to enhance energy, promote weight loss, or increase endurance. Energy bars can be consumed before, during, and after athletic events to ensure sufficient energy and replace expended nutrients. They may also be used as a snack or meal replacement.