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In recent years it has been reported that childhood obesity is increasing. According to clinical observations and academic researches, this increase is related to bad nutritional habit and lack of physical activity. It is known that the problem is caused by urban life limiting the activity of children, and negatively affecting their eating habits. The increased time spent for TV watching and computer games influence the children’s daily life routines negatively by decreasing physical activity. Childhood obesity leads to early manifestation of various obesity-related health problems such as cardiovascular diseases, diabetes etc. Recent researches have shown that 42-63% of people being obese during childhood have obesity in their adulthood as well. The purpose of this study is to investigate effects of sports activities to 7th and 8th grade students' nutritional behavior and obesity situations of Uluğbey Elementary School in Bayrampaşa District of Istanbul. In this way, it was aimed to contribute to combating obesity, to healthy growth and development of children, and to long-term preventive medicine practices.