Diabetes is one of the ten leading chronic diseases in the world and in Croatia. It follows the global trend of an increase in morbidity in accordance with the unhealthy lifestyle changes and takes on the characteristics of the pandemic. It represents a major problem because of the underlying disease resulting additional diseases and complications that significantly reduce quality of life. In economic terms are a great burden for patients, theirfamilies and national health systems. These are all reasons why it is extremely important to recognize the way that environmental factors and lifestyle lead to the occurrence of diabetes, and in time to influence them. Prevention of diabetes at all levelsof the health system is a key determinant of combating the spread of disease. Objective:The objective of this study is to determine the analysis opportunity environmental influences and lifestyle as they work during the life of the occurrence of diabetesand its subsequent complications, determined on the basis of surveys of patients their subjective feeling of health in terms of mental, physical and social functioning, tested and evaluated Some of the dietary habits and smoking habits on the basis of measurements to determine the average body mass index and determine the subjective sense of overall satisfaction with life. Methods: The study was conducted on 150 patients in the town of Labin. It lasted from October 2014 to March 2015. It is a cross-sectional survey research. To create a work of literature was used in Croatian and English, and individual modules from the Croatian Health Survey ((CAHS 2003/10), Croatian Adult Health Survey 2003/10) and a module of socio-economic, demographic characteristics of the selected patients, the SF-36 questionnaire, module about eating habits, smoking and quality of life and in every subject measured weight and height and calculate body mass index.