This well-done retrospective cross-sectional study delivers just what we want from such a study design: a clear path forward to develop a prospective trial to answer a specific question...Investigators looked at data from 6489 children and adolescents in the NHANES database who completed questionnaires and also underwent dual-energy x-ray absorptiometry (DXA) scans. Of those, 159 participants reported use of stimulant medication, presumably for treatment of attention-deficit/hyperactivity disorder (ADHD). They found lower bone density measurements in the stimulant users.