studies have shown that the addition of fiber produces an in- crease in hardness, this was observed in bakery products for biscuits when flour was substituted with orange pulp (Larrea et al. 2005), brewer’s spent grain (Öztürk et al.
2002), wheat bran (Gujral et al. 2003), and lemon, ap- ple, and mango fibers (Ajila and Prasada Rao 2008). These adverse effects by fiber addition are generally referred to increased hardness, loss of crispiness and reduced spread ratio.