Diabetes melitus is a metabolic disorder caused by relative or absolute insulin deficiency. Recent research results demonstrate this disease as a fast- growing problem, as its exponential growth has been reported worldwide, and correspondingly, Croatia is closely following these growing trends.A certainly discouraging circumstance is the fact that these symptoms are very often not evident , this mostly refers to diabetes type 2 , which is the most common type. Metabolic disorder and prediabetes are conditions that considerably increase the risk of developing diabetes. Therefore, early diagnosis and regulation of these two disorders are essential in order to prevent the risk of acquiring diabetes. Diabetes treatment is an additional financial burden for the heath- care system, and this is mostly evident due to the fact that 10% of the Croatia Government Budget is spent on diabetes treatment, Most of these expenditures refer to the treatment of diabetes complications. Diabetes complications , i.e their manifestation, are proportional to the duration of the disease. The prevention of diabetes complications can be realized by regulating the metabolic status ,which is achieved through patient cooperation and education about diabetes. It is important for the doctor to be able to conduct a psychosocial assessment of the patient and to define a treatment plan based on this assessment. These steps are preconditions for the successful cooperation between the doctor and patient.