Impact of childhood obesity on IQ and brain performance of children. Children's intelligence and childhood obesity. A correlation between childhood obesity and children's cognitive ability. Research Problem The rate of obesity is increasing every day around the world (Ahmad et al., 2010). It is generally assumed that the main cause of obesity is excess calorie intake in the form of fast food compared to calorie intake (Ahmad, Ahmad & Ahmad, 2010). Excessive consumption of fats, sugars, beverages and fast food as well as consumption of fewer vegetables and fruits lead to increased abdominal fat and obesity (Powell and Han, 2011). In the United States, the prevalence of overweight in 2007-2008 among young children aged 12 to 19 was 18.1% (Powell and Han, 2011). It has been well documented that the obesity rate is between 25 and 30% in industrialized countries such as Australia, England and the United States (Mehta, Coveney, Ward, Magarey, Spurrier & Udell, 2010) . Research has proven that overweight and obesity are closely linked to other diseases such as heart disease, diabetes mellitus, high blood pressure, bone problems and sleep disorders (Mehta et al., 2010) . Additionally, obesity can harm not only the body but also the nervous system (the brain) (Belsky, Caspi, Goldman-Mellor, Meier, Ramrakha, Poulton, & Moffitt, 2013). Brain imaging studies suggest anatomical and physiological defects in obese children and therefore negatively impact intelligence quotient (IQ) (Belsky et al., 2013). It is assumed that obesity can significantly damage the brain and cause serious social problems in children, for example, they may have compromised cognitive abilities (Belsky et al., 2013). What we already know In the United States, the prevalence of...... middle of paper ......ity influenced by childhood obesity and overweight. Children's academic performance can also be considered a variable in relation to childhood obesity and overweight. By exploring the relationship between childhood obesity and intelligence, we can predict whether obesity impacts children's intelligence and cognitive impairments. Due to the lack of evidence on childhood obesity and children's intelligence, it is very difficult to develop a framework in which physical and mental health can be considered to be of equal importance. This study will add knowledge to the existing body of knowledge to develop a holistic system to combat childhood obesity. Furthermore, if there is a relationship between obesity, intelligence and academic performance, this will be an opportunity to develop a robust system for children to improve their metallic abilities..