RESUMEN
Individual obesity is the result of a complex interplay among genetically determined body habits appetite ,nutritional intake, physical activity and environmental factor. Obesity is increasing worldwide to the extent that WHO recently declared that obesity considered as pandemic. It is constituted one of the leading future threads to public health .The main target of this work was to study the effect of food habits and physical activity on body weight among primary school children. The total sample included [842] boys number was 389 [46.19%] and Girls number was453 [53.8%] girls .Obesity represented 47% of the total sample size 55% in boys and 40% in girls their age from 6-12years from primary school in Cairo governorate. Results showed that the vast majority of boys and girls [86.7 %] [ 86.9 %] take three meals per day, while a few of them [9.4%] [10.2%] take two servings, and a minority of them [3.1% and 2.7%] takes more than three meals. Results revealed that a high percentage take snacks in between meals [93%] in boys [89%] in girls . Results showed that the percentage [80.2 %] [.80 %] of boys and girls, consume junk food during watching T.V. Majority of the study sample take pocket money at school by [95.8 %] [96.9 %] [boys and girls Respectively Practicing physical activity was low in obese children compared to non-obese The major contributor to the rapid increase in the prevalence of obesity was low physical activity calorie-dense, nutrient food- and eating while watching T.V