Fiber One bars do not provide a great source of protein, vitamins, or minerals. All five varieties provide about 10 percent of the recommended daily value for calcium. Only the oats and chocolate bars provide significant amounts of vitamin A and iron, and the rest of the bars do not have significant amounts of any nutrients. The nutritional value of Fiber One varies depending on flavor. To find out how much protein a particular bar contains, check out the Nutrition Facts label on the package.
Fiber One oats and chocolate bars contain 140 calories per 40-gram serving.