Without gluten, bread would be very dense or flat. Rice, potato, and oat flours do not have gluten, and bread made from these flours does not turn out well.
Did you Know?
Some people are unable to eat gluten because of either a wheat allergy or celiac disease. Gluten causes damage to the intestines and stomach of a person with celiac disease.
Reference
VanDyke, E.M. 2007. Chemistry Supplement to High School Food Technology. Pittsburgh Teaching Institute.
http:\www.chatham.edu/pti/Kitchen_Chem/VanDyke_01.htm