I self medicate with caffeine and have known it for years. Though changing my diet has worked better for controlling my ADHD than anything except pharmaceuticals. I'm in my late 40's and have been diagnosed ADD / ADHD since the 1980's. A low carb diet works decently for me. It's not 100% like being on Adderall or Ritalin but I am more focused and able to stop spinning my wheels most days. I also am a nicotine user so that adds to the mix.