Educational and Practical Guide "Type 1 Diabetes Mellitus," ed., I.I. Dedova, et al., Addressed primarily to patients with endocrine dysfunction in order to increase the participation of such patients in the correction of the disease and its complications. Basic issues of diabetes mellitus are considered: definition of concepts, epidemiology, pathogenesis, the concept of insulin therapy, specific nutrition, hypoglycemia, physical activity, self-control of the course of the disease, its possible complications, and the course of concomitant pathology against this background.