Background: Obesity means an excess amount of body fat. No general agreement exists on the definition of obesity in children as it does adults. Most professionals use published guidelines based on the body mass index (BMI), or a modified BMI for age, to measure obesity in children. Others define obesity in children as body weight at least 20% higher than a healthy weight for a child of that height, or a body fat percentage above 25% in boys or above 32% in girls Objective: to estimate the serum level of copper among obese children. Methods: This comparative study was conducted on fifty of overweight and/or obese children (based on BMI) and thirty of clinically healthy, age and sex matched children's served as controls also, the cases and controls were selected randomly from the pediatrics outpatient clinic of Benha University Hospital and Sheben El Kom Educational hospital, in the period between 2013 to 2015. Parental consent was obtained for all children included in the study. Results: In the current study there were no significant difference found between patients and control group regarding age, sex and residence, but there was significant difference between the two groups regarding income and socioeconomic state. P=0.04. Also, there were no static difference in height in patient when compared to control group, and patients had a higher statically significant Weight, BMI and Skin fold thickness when compared to control group. Additionally, that there were significantly higher rate of frequent bad nutritional habits including shipping breakfast (p=0.022) consumption of energy- dense food and food consumption during TV watch in patients than controls. P< 0.001 and the children's physical activity levels were lower in the patient’s group than the control group. P<0.001. Conclusion: The obesity varied remarkably with different socioeconomic levels. Obese children had a characteristic nutritional pattern like skipping breakfast and consumption of energy dense food