The pH at which the viscosity changed was only slightly dependent on the types of acids, and the general tendency mentioned above was not dependent on the types of acids. In other words, the viscosity of the pastes is a function of pH and does not depend on types of acids. The viscosity change was induced by the changes in the size of starch granules and the number of chains of amylose and amylopectin (glucose chains), which were induced by pH change.