In his last interview shortly before his death, Dr. Leon Eisenberg, the father of the ADHD Diagnosis stated that ADHD is a "Fictitious Disease" and is now being pushed by big pharma, and the medical industrial complex to push ritalin sales https://www.ccdu.org/sites/default/files/media/docs/LeonEisenberg.pdf and this has been stated as true by snopes https://www.snopes.com/fact-check/work-of-fiction/