HCR Update from Mark Sanna: New information has emerged suggesting that obesity in those with ADHD is caused by the medication used to treat it. According to Reuters, scientists at Johns Hopkins Bloomberg School of Public Health in Baltimore are re-evaluating the way that doctors link obesity and ADHD. The study, conducted by Dr. Brian S. Schwartz, hopes to educate parents of children with ADHD of the possible rapid weight gain that, according to him, occurs as a direct result to stimulant treatment. Dr. Schwartz and his team's ground-breaking study not only helps to explain why obesity may occur in ADHD teenagers, but it is also the first to suggest that it is linked to the use of stimulants such as Adderall and Ritalin.