en پژوهشي اصیل Original Research <strong>Background and Objectives:</strong> The prevalence of overweight and obesity as a major risk factor for several&nbsp;chronic diseases is increasing rapidly worldwide. Several studies pointed a correlation between obesity and nutrition&nbsp;pattern in children and adults. However, there are still some controversial aspects about this association.&nbsp;The aim of this study was to investigate the relationship between body mass index and nutritional pattern in adolescents.<br> <strong>Methods:</strong> This is a case-control study including 204 7th -12th grades high school children elected through&nbsp;multiple cluster-sampling in Birjand city. A questionnaire consisted of nutritional patterns was used. Data were&nbsp;analyzed using SPSS v.15. The statistical tests used were Chi square and t-test at &alpha;= 0.05.<br> <strong>Results:</strong> There was no significant difference in age, gender and grade of school between overweight/obese&nbsp;and normal weight subjects. Although there was higher calorie intake in obese/overweight group, but there was&nbsp;no significant difference discovered. There was lower consumption of breakfast in the obese/overweight group&nbsp;(p=0.04). The average number of meals during one weak was significantly more in obese adolescents than normal<br> ones (p<0.001). However, the number of days with breakfast consumption was significantly more in normal&nbsp;students (5.79 vs 5.1 or p=0.03).<br> <strong>Conclusion:</strong> The amount of calorie consumption was not different between case and control in this study,&nbsp;thus, other factors including physical inactivity and genetic factors should be investigated in further studies. چاقی, اضافه وزن, نمایه توده بدنی , تغذیه Obesity-overweightness, Body Mass Index, Nutrition 5 1 http://ijca.iums.ac.ir/browse.php?a_code=A-10-48-1&slc_lang=en&sid=1 Kokab Namakin d_namakin@yahoo.com 1003194753284600490 1003194753284600490 No Birjand University of Medical Sciences, Birjand, Iran Noshin Molae noshinmolae77@gmail.com 1003194753284600491 1003194753284600491 No Birjand University of Medical Sciences, Birjand, Iran Gholamreza Sharifzadeh rezamood@yahoo.com 1003194753284600492 1003194753284600492 No Birjand University of Medical Sciences, Birjand, Iran Seyed Alireza Javadinia javadinia.alireza@gmail.com 1003194753284600493 1003194753284600493 Yes Mashhad University of Medical Sciences, Mashhad, Iran