Although energy bars vary in their nutritional content, most bars are pretty healthy. Energy bars have a combination of carbohydrates and protein in them, which make them a good snack to have before or after exercise. Although energy bars may be convenient, there are plenty of other snacks that are just as healthy as or even healthier than energy bars, such as veggies and hummus, apple slices with peanut butter, or cheese and whole wheat crackers.