Most energy bars are intended for athletes or for those who are serious about their workouts -- some are intended as meal replacements. Some energy bars are more like candy bars, sneaking saturated fats, sugar and hydrogenated oils into their ingredients -- the calories can equal popular chocolate candy bars. Calorie to calorie, a PowerbarProtein Plus Chocolate Brownie energy bar, for example, has 360 calories while a Snickers bar, in comparison, has 250 calories. Unless you're engaging in high-intensity training workouts, neither is a good snack option. Both have more sugar than recommended per day for an adult woman. Make sure the energy bars you nosh on are snack-sized -- that's between 100 and 200 calories per bar -- and keep the sugar and carbohydrates low. Compare nutrition labels to find the better bars. And if you're engaging in high-intensity workouts, look for energy bars that deliver a good protein source.