Isn't it rather deceitful to claim a biological cause for a supposed disorder that has not been validated as a disease?
"ADHD is a genetically determined condition that affects the parts of the brain which control impulses, concentration, and attention" (quoted from Check-Up BBC Radio 4 on 23 August 2007).
Where is the evidence to support that statement?
A 2003 article in Science summarised comments from various researchers yet the researchers admitted to being unable to identify the specific genes or environmental factors involved.
"One thing seems clear: No matter how these purported ADHD genes affect dopamine, they cannot cause the disorder by themselves. So far, scientists estimate that each gene confers a very low added risk ? roughly 1% to 3% ? of developing ADHD."
"Susan Smalley, a geneticist at the University of California, Los Angeles, recently led the first genome scans of siblings sharing ADHD. "We're operating on the idea that a couple of genes may add 10% to 25% of ADHD risk," Smalley says."
"Environmental risks, researchers predict, will be even harder to pin down than genes contributing to ADHD. They've begun linking ADHD symptoms to lifestyle factors, from maternal smoking during pregnancy to chronic family conflict. But because such adversities boost the risk of many disorders, the links are hard to interpret."
[see Science 11 July 2003: Vol. 301. no. 5630, pp. 160 - 161]
In other words, these researchers don't actually KNOW!