For the most part, YUP. However, ADHD is not a chemical problem, it's a brain disorder that you're born with (there is tons of scientific research backing this up).
But YES otherwise. Alcohol screws with your body/brain, and Alcoholism, ADHD, Depression and Anxiety are all tightly linked in cause and effect.
> Take a multivitamin, drink more water, sleep more, get outside more. Oh, and always say YES to any social invitation.
and while all of this is good general life/health advice, it has nothing to do with ADHD.