Another study, published in the 1983 journal Experientia, investigated the effect of Pectin and Cellulose in the ability to actually dissolve stones in test animals. The results indicated that cellulose (found in crisp fruits and vegetables) is able to "slightly" decrease the rate of gallstone formation. Cellulose was not, however, able to reduce the size of pre-established gall stones. Pectin (found mainly in apples) has a greater effect in stopping gallstone formation and of great interest, was found to DISSOLVE pre-established stones as well!!!