Fiber One 90 Calorie Chewy Bars are a snack that makes weight management easier for busy consumers. Each bar contains only 90 calories, five grams of fiber and 2.5 grams of fat to help dieters feel full and stick to their diet without compromising taste. Just one Fiber One 90 Calorie Chewy Bar has five grams of fiber, 20% of the daily recommended fiber intake according to the Institute of Medicine’s daily fiber recommendations. The bars are available in two varieties, chocolate and chocolate peanut butter.