Being obese doesn’t just hinder your physical speed but that of your brain as well. A study showed a slower cognitive processing speed and brain difference in obese teens. In the cognitive tests, obese adolescents had slower cognitive processing speed compared to the healthy weight adolescents. Researchers also found differences in the brain images within obese and healthy weight groups in the anterior portion of the corpus callosum, the band of nerve fibres that joins the two hemispheres of the brain and is responsible for transmitting neural messages between them. This difference, researchers hypothesised, may partially explain the processing speed findings.