The influence of cellulose-containing vegetables, added to the breakfast, on the blood glucose and insulin levels, was investigated in patients, suffering from type II diabetes mellitus and healthy humans. It was shown, that cellulose promotes a decrease in the glycemia and a rise in the insulin level 1 to 1.5 hours after the breakfast. On the basis of their own results and data of other authors it was concluded that cellulose exerts a good effect upon the blood glucose level and its use should be recommended as a dietetic treatment component in patients with type II diabetes mellitus.