Are these actually good for you? The past two weeks I've been having one before working out, only if I haven't had time to eat. They're nice cause they fill me up with carbs and give some energy for working out, but are they designed for pre or post workouts? They are protein bars so I would assume post, but that is what my shake is for. Are the bars even necessary, and if not necessary will they even make a difference? Like I said, they are only for when I don't have time to eat food before working out. Thanks