Protein bars are a type of energy bar that contains a higher ratio of protein to carbohydrate. The bars are ideal for fitness enthusiasts looking for optimum muscle repair and growth. Some protein bars are designed to act as a meal replacement for consumers wishing to lose weight. It’s important, however, to note that permanent long-term weight loss is often a result of a combination of diet and exercise. Although protein bars are widely known to aid in weight loss, it is recommended that you consult your doctor or nutritionist before adopting a weight loss program.