The aim of our study was to evaluate the efficiency of an individual intensive educational control program on improving the metabolic control of insulin-dependent diabetic patients at short- and long-term follow-up. Fifteen insulin-dependent diabetic subjects with poor metabolic control (hemoglobin Alc > 9%) were included. At entry, their knowledge of diabetes (DKQ2 test), total energy intake and its distribution, insulin schedule, technical skill for insulin administration and self monitoring of blood glucose were evaluated. According to the initial evaluation, individual goals were stipulated and monitored in weekly visits. Individual life-style was particularly kept in mind. Thereafter, patients were switched to our ambulatory clinic for outpatients. At 1, 6, 12 and 24 months of follow-up, the items analyzed at the beginning were reevaluated. After 1 month, the program produced a significant decrease in hemoglobin Alc and an increase in knowledge of diabetes. The same beneficial effects were present at 6, 12 and 24 months evaluation compared to those values recorded at entry. There were neither major changes in dietary intake nor insulin schedule nor any increase in the frequency of hypoglycemic episodes. In conclusion, our program (5.2 +/- 0.8 weekly visits) significantly reduced and sustained hemoglobin Alc values close to those levels recommended by multicenter controlled trials. We consider that our program produced two major changes: a long-lasting improvement in knowledge of diabetes and an increase in self-monitoring blood glucose which provided the key for optimal self-regulation. Our study demonstrates that an individual intensive educational control program is useful as a tool to get a long-lasting improvement in metabolic control in insulin-dependent diabetic patients.