I was treated both as a child and as an adult. After I quit my adult medication I was a wreck, and ended up going to therapy. It wasn't specifically to address ADHD, but just me in general. I took a break from work, began eating well, sleeping well, and exercising, and I feel like I've gotten a lot better at focusing. My diet became more or less low-carb, and I did strength training. Could those be it? I don't know, but I feel a lot better and am more professionally accomplished than I ever was. There's my anecdote.