They are often fortified with vitamins and minerals, which can help fill nutritional gaps.
But, like many foods in a specific category, not all energy bars are created equal. Those that are low in saturated fat and sugars, with a decent amount of protein and fiber, can provide a nutritious, satisfying pick-me-up. Others can closely mimic a candy bar. For example, some bars covered in chocolate contain as much saturated fat as a Snickers bar; others contain almost as much sugar.