Purpose: Due to the increasing incidence of chronic noncommunicable diseases (NCD) in young people, it is important to investigate relations between NCD risk factors on body nutrition levels. Therefore, the primary goal of this study is to investigate the frequency of risk factors for NCD in urban adolescents of different body mass index (BMI) category. The accompanying objective is to determine the dependence of the occurrence of individual risk factors on BMI category in adolescent girls and boys. Methods: 838 first grade high school students from Zagreb participated in this investigation. Anthropometric measurements were used to record the data on body weight, body height and waist circumference. The computer version of the SHAPES questionnaire provided data on physical activity, time spent in front of the screen, smoking intensity and socioeconomic status of participants. Blood pressure was measured by auscultatory method, using a cuff and a mercury sphygmomanometer. Results and conclusion: The incidence of waist circumference categories from 90th to 97th centile and above 97th centile in adolescents was dependent on participants’ BMI category. In addition, the proportion of high blood pressure category in girls and boys of the same population was also dependent on the BMI category. Other risk factors (screen time, physical inactivity, and smoking) did not reveal a statistically significant dependence on the BMI category. Obese girls and boys have had the highest values for of all investigated risk factors, leading to increased possibility of developing NCD. Together with previous studies, this work suggests that young people should engage in more physical activity and improve their dietary habits to reduce the incidence of obesity and decrease the risk of NCD.