From Dr. Sachs: "Take with a grain of salt and don't just believe one study. Nevertheless, I felt this was an important article/study to pass along that just made the news." A study of more than 30,000 British adults diagnosed with attention deficit hyperactivity disorder, or A.D.H.D., found that, on average, they were dying earlier than their counterparts in the general population — around seven years earlier for men, and around nine for women.