Childhood obesity has become one of the most serious public health challenges of the 21st century. Obesity can affect a child's physical health, through cardiovascular, endocrine, or pulmonary diseases, and psycho-social health, through the development of poor self-esteem, eating disorders, and depression (Inchley et al., 2016). Obesity can also affect educational attainment (Cohen et al., 2013). Furthermore, childhood obesity is a strong predictor of adult obesity, which has health and economic consequences (WHO, 2016).