Nutrition For Sustained Energy. With A Mix Of Carbohydrates, Protein, And Fiber, Clif Bar Is A Moderate Glycemic Index Food. What Does This Mean? Basically, You&';ll Benefit From A Steady Increase In Blood Sugar Levels Followed By A Gradual Decline (Sustained Energy!). Know What That Means? You Keep Going.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }