Among youth with attention-deficit/hyperactivity disorder (ADHD), declines in body mass index standard deviation score (BMI-sds) and height-sds were observed after 18 months of psychostimulant treatment, according to research published in the Journal of Child and Adolescent Psychopharmacology. However, researchers advocate further studies after finding that correlations with dosage were weak and that declines in BMI and height were not consistent among subgroups.