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Protein bars are designed to help you gain muscle mass. These bars attempt to cram as much protein as possible for recovery from strenuous workouts.

Energy Bars are supplemental bars containing cereals and other high energy foods targeted at people who require quick energy but do not have time for a meal.

Cereal bars are bars made from cereal grains like oats, rye, rice, and wheat. You may also hear a cereal bar called a “breakfast bar,” in a reference to the fact that many people eat cereal bars in lieu of breakfast, although this food can technically be eaten at any time.