The nutritional value of Fiber One products vary by type. For example, Fiber One Protein Bars have between 120-130 calories, 6 grams of protein, 7-8 grams of fiber and 2 grams of sugar. Fiber One Soft-Baked Bars all have 70 calories, 6 grams of fiber and 2 grams of sugar. Calcium and iron content varies by product line and flavor. If you're looking for a Fiber One product with more nutritional value, Fiber One Original Bran Cereal might be the better option. A 2/3 cup serving has 90 calories, 18 grams of dietary fiber, no sugar and 20% DV of the following vitamins and minerals: Iron, Folic Acid, Vitamin B6, and Vitamin B12. Zinc Fiber One Original Bran Cereal also has niacin (10%), phosphorus (6%), calcium (10%), vitamin C (10%), Riboflavin (10%) and magnesium (8%). Daily Values (DV) are based on the average 2000 calorie per day diet.