ADD/ADHD isn't a mental illness! I've been ADD my entire life (tests after my 26th birthday last year confirmed I didn't outgrow it, FYI) and I can tell you that much.  I have difficulty concentrating on things that aren't that interesting to me. Unless I'm hyper focused, I can't drown out background noise. I'm restless. I notice everything. I had discipline problems and couldn't follow directions growing up (and sometimes to this day).  But I do NOT have a mental disability!  I'm intelligent. I notice things people miss. I bring unique perspectives and different ways of solving problems to the table. I'm incredibly creative. I thrive under high stress conditions. I move fast. I'm always busy. I'm social. I'm easy to talk to. I'm energetic. I think outside the box. And I HAVE NEVER BEEN OVERWEIGHT, even when I haven't been on medication.  That's not a disability. Yeah, it's caused me to try a little harder in school and I've had to make extra efforts to train myself for the real world. But that doesn't mean I have a disability.  ADD/ADHD is, in my (and the experts I've interacted with) opinion, over diagnosed. Which is why I believe that it can't be linked with obesity. Yeah, there's similarities between an ADD person's challenges and an obese person's laziness, but the difference is this: ADD/ADHD people work hard and thrive; obese people make excuses and fail.