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<strong>BACKGROUND</strong>: To determine the prevalence of overweight and obesity among a sample of middle class junior high school students in a district of Tehran and its association with certain demographic and dietary factors this study was carried out. <strong>METHODS</strong>: Weight, height, waist and hip circumferences were measured and information on two-day food intake and demographics on 398 students aged 10-15 years from district 6 in Tehran were collected.<br /> <strong>RESULTS</strong>: Prevalence of overweight and obesity in the studied girls were 19%, 6.5% and in boys were 14%, 13%, respectively. There was an inverse relationship between numbers of siblings and BMI. Overweight/obese students, bought snacks from school shops more frequently than other students did.<br /> <strong>CONCLUSIONS</strong>: Findings showed that the high prevalence of overweight/obesity can be related to the household size, including the number of siblings and the pattern of snack purchase by the students.<br /> <strong>KEY WORDS</strong>: Obesity, body weight, body mass index, waist-hip ratio, overweight, adolescents.<br />