Type 1 diabetes (T1D) is an autoimmune disease characterized by the destruction of the β-cells in the pancreas known as the islets of Langerhans, which are responsible for producing insulin and maintaining blood glucose levels within a narrow range. Insulin deficiency leads to hyperglycemia and, in the long term, the development of microvascular and macrovascular complications of the disease. Adequate glycemic control is important for preventing complications, and treatment is based on flexible intensive insulin therapy, which enables free choice of diet. Dose Adjustment for Normal Eating (DAFNE) is structured education program designed for patients with T1D. This program aims to teach patients how to match their carbohydrate intake with prandial insulin doses to improve glycemic control. This retrospective study aims to determine the effect of DAFNE group education using new technologies, explicitly monitoring glucose in the interstitial fluid using FreeStyle Libre 1 (FSL), and HbA1c levels. Additionally, the study aims to determine the prevalence of complications and specific regulation problems among the participants. Data from 126 participants over 18, diagnosed with T1D for more than six months, were collected and analyzed. The participants attended the DAFNE education program at the Department of Endocrinology of the Clinical Hospital Center Zagreb from 2016 to 2020. Following the educational program, a significant improvement in glycemic control based on HbA1c and FSL was observed. The most common complication of diabetes in this study was diabetic retinopathy, and the most frequent specific regulation problem in glycemic control was recurrent hypoglycemia. The education did not lead to a reduction in time spent in hypoglycemia.