ADD and ADHD - evolution?

CDC Report Looks at Attention-Deficit/Hyperactivity Disorder
According to a new report released by the Centers for Disease Control and Prevention (CDC), approximately 1.6 million elementary school-aged children have been diagnosed with Attention-Deficit/Hyperactivity Disorder (ADHD). In a national survey, the parents of 7 percent of children 6-11 years of age reported ever being told by a doctor or health professional that their child had ADHD.

At some point, don't you just ask the question, is this a natural phase of evolution?

What if ADD and ADHD were just natural by-products of our over-achieving, capitalistic society? Children just acclimatizing.

Once you get to a point where 7% of a population is diagnosed with anything.... don't you think you need to change your prognosis?