The analyses of the KiGGS (German Health Interview and Examination Survey for Children and Adolescents) dataset showed that MPH (methylphenidate) use in boys with ADHD is associated with low BMI (body mass index). Methylphenidate use in boys with ADHD is associated with having low body mass index (BMI), having low height, and increased systolic and diastolic blood pressure.

https://bmcpsychiatry.biomedcentral.com/articles/10.1186/s12888-018-1884-7