ADHD
"Well it started in 2014 when I was diagnosed with adhd.... And I could not focus for more than 5 minutes before doing something else and this has helped me greatly focus and calm me down.  We also own a farm and I drive a skid steer loader and drive a tractor, also doing fieldwork takes a good deal of focus and now I can easily do 5 hours of bale loading and not get distracted which is a lifesaver. One downside is that I lose my appetite but not a big deal to me."