Researchers found that physical fitness and body fat each have their own links to children’s self-control, showing that these two health factors may affect the brain in different ways. Body fat showed a different pattern. Children with more body fat tended to respond more impulsively, but they were not more accurate than children with lower body fat. This suggests that fitness and body fat affect the brain through different pathways. However, the study cannot prove that increasing fitness or reducing body fat will automatically improve self-control because it only observed existing differences.