The present study investigates the effect of obesity and overweight on children's cognitive abilities and well-being using survey data from West Bank schools. The results show the significant adverse impact of obesity on a child's well-being by raising externalizing (behavioral) problems and increasing the probability of classifying a child with abnormal mental health difficulties, according to the Strength and Difficulties Questionnaire (SDQ), while no such impact was founded on the cognitive test results. The analysis further exposes that teachers' negative attitude toward obese students is an important factor that contributes to the association between obesity/overweight and higher SDQ scores.