Abstarct: Introduction: Adolescence becomes one of the most critical periods of human development in which nutrition plays an important role. Nutritional assessment is considered as one of the key determinants of health and performance. Improving the health level of teenage girls as future mothers can The future generation of the society will grow up. Therefore, the puberty period provides an exceptional opportunity to intervene in improving the nutritional status. Obesity and excess weight are important health problems in societies Physical activity is considered one of the important factors in the quality of life related to health. Therefore, investigating the relationship between physical activity, knowledge, attitude and nutritional performance with body mass profile in students can provide appropriate basic information for experts to make appropriate decisions. In this descxriptive study, a number of 270 female students in the age range of 14.3 ± 1.3 in Miami city in 1401 were selected using a purposeful and accessible sampling method and completed a questionnaire containing demographic information, awareness, attitude and nutritional performance and an international physical activity questionnaire. They were analyzed at the significance level (P>0.05) using SPSS software.In total, the knowledge score was 48.7, the average performance was 48.1, and the attitude score was 41% of weak students (P>0.05). Statistically significant relationship between nutritional level and body mass index, nutritional attitude level and body mass index, nutritional performance level and body mass index of the study was obtained. In the study, there was no statistically significant relationship between knowledge and nutritional attitude, nutritional attitude and nutritional performance of the girls participating in the study. But a statistically significant relationship between nutritional awareness and nutritional performance and physical activity and nutritional performance was obtained. The above results reveal the necessity of nutritional and sports interventions in teenagers.