Introduction:Obesity is the most prevalent nutritional disease among children and adolescents in Iran. Awareness of obesity risk factors in childhood and adolescence and their control is one of the most important public health problems. This study was conducted to determine the relationship between obesity, physical activity, food habits and television viewing among students in Yazd .
Methods: In this study, 334 students who aged between 12 to14 years old were selected by cluster sampling. Considering age and gender,  underweight, normal weight, over weight and obesity were defined as BMI<5 th percentile ,5 .
Results: The prevalence of overweight and obesity was 17.7% and 21%, respectively. The prevalence of obesity was significantly higher in boys (p = 0.006) and students whose mothers had higher education (p = 0.02). The results of logistic regression model showed that consumption fruit once and less than one in week increased the risk of overweight and obesity by 20.07 and14.76 times, respectively.  A significant relationship was observed between increase hours of computer games and obesity. There was no relationship between consumption of fast food, soft drinks, cakes, biscuits, chips, puffs and watching TV with obesity and overweight.
 
 

Keywords: obesity, physical activity, dietary behavior, television viewing

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