Energy bars are supplemental bars containing cereals and other high energy foods targeted at people that require quick energy but do not have time for a meal. They are different from energy drinks, which contain caffeine, whereas bars provide food energy. It is widely recognised that individuals should seek out low glycemic products that have a slow release of energy over a longer period of time. Truly effective energy bars need to provide fast-acting carbohydrates to facilitate ultra quick energy delivery. They also need a generous glycemic content to help ensure that a body is properly fuelled when it needs it most. The purpose of a energy bar is to remedy fatigue and improve concentration at vital times. The first energy bar in the American marketplace was Space Food Sticks which Pillsbury Company created in the late 1960s to capitalize on the popularity of the space program.