No fillers in our bars. Just natural ingredients. Other bars on the market are often loaded with cheap fiber fillers such as inulin, chicory root or tapioca fiber. These bulk fiber products are often known for the unfortunate side effect of making people gassy. In addition to digestive distress, IMOs and fiber fillers have been shown to raise blood glucose levels. If you’ve tried some of the high fiber bars out there, you might have noticed.