In order to establish a simple and yet reliable objective method for evaluating masticatory function, quantitative evaluation of masticatory function was attempted by analyzing the amount of glucose discharged during gumi-jelly chewing. 20 normal subjects were asked tochew gumi-jelly and the respective correlation between the amount of glucose discharge andmandibular movements as well as masticatory muscular activities were investigated. As a result, by chewing a piece of 2 g cylindrical gumi-jelly, 10 mm in both height and diameter, it was clear thatthe amount of glucose discharge was proportionally related to both the path andrhythm of themasticatory movement and the amount of masticatory muscular activity. Therefore, it was suggestedthat it was possible to establish a quantitative method for evaluating masticatory functionincluding masticatory efficiency, movement function, and masticatory muscular activity, in otherwords, a simple and reliable method for objectively evaluating masticatory function by analyzing theamount of glucose discharge.