BackgroundThe diagnosis of type 2 diabetes mellitus (T2DM) carries with it a number of changes to the patient’s lifestyle. A healthy lifestyle, health and preventive behaviors, as well as healthy nutrition habits play a key role in treating T2DM as well as limiting its complications.Materials and methodsThe aim of this study was the analysis of the correlation of T2DM patients’ health behaviors and their influence on the patients’ quality of life. The study was performed on a group of 50 patients from the Kuyavian–Pomeranian Voivodeship. In this study, the Health Behavior Inventory and the Satisfaction with Life Scale were used. The results were statistically analyzed. The study was approved by the ethics committee.ResultsThe intensity of severity of health behavior and satisfaction with life of T2DM patients depends on the gender of the patient (P<0.05). The analysis of the patients’ behaviors in four categories, proper eating habits (consuming vegetables, fruit, whole meal bread), health practices (daily physical activity, recreation, sleeping habits), preventive behaviors (including keeping to health recommendations), and positive mental attitude, showed substantial correlation of the Health Behavior Inventory and the Satisfaction with Life Scale (P<0.05).ConclusionThe categorization of the prohealth behaviors shown by diabetics allowed us to measure the connection between the individual categories of satisfaction with life. Males with T2DM showed a higher satisfaction with life score than females with the same diagnosis. The analysis showed that patients with a higher intensity of health behaviors also had superior health behaviors. The resulting correlations prove a notable relationship.