Bread volume was reduced after the addition of hazelnut fiber (Anil 2007), sugar beet fiber (Filipovic and others 2007), and apple fiber (Chen and others 1988). This phenomenon was possibly a result of the fiber weakening or crippling dough structure and reducing CO2 gas retention (Chen and others 1988; Sangnark and Noomhorm 2004). Moreover, appreciable amounts of water could have strongly bound to the added fibers during breadmaking, so less water was available for the development of the starch-gluten network, causing an underdeveloped gluten network and reduced loaf volume (Brennan and Cleary 2007). Therefore, the 2 mechanisms causing reduced loaf volume are the dilution of gluten, and the interactions among fiber components, water and gluten (Anil 2007). The