It is clear that ADD behaviours can be severe enough to cause problems, and that there are a lot of people who carry these behaviours around with them, but it is not certain that ADD is an objectively definable disease. For instance, ADD has been described and recognised by the US psychiatric establishment for more than 30 years (although its name has been changed a few even times over that time), but the UK establishment only officially recognised ADD in the 1990s - this despite the first published work on ADD being in the UK a hundred years before. Even in the US, ADD has only recently (ie in the last ten years or so) been widely recognised as occurring in adults - it was considered a childhood affliction which was obliterated by adolescence.
Part of the problem is that labelled conditions such as ADD, OCD, etc are note discrete: a bone is broken or it is not broken, but ADD has more degrees than there are labels, and even then it is not clear that even someone whose collection of symptoms is technically pathological enough to be so labelled is actually displaying anything more than just a strong personality trait. There has been work to scan brains under ADD-expressing conditions, and there are apparently common factors to those scans, but ADD is at best a collection of possibly related symptoms. But then is personality just an expression of brain chemistry?
As I say, my belief is that those who are actually disadvantaged by their ADD behaviours are those who have been trying to use their brains in ways which don't mesh with their brain chemistry or personality, where "one size fits all" education systems teach the same learning mechanisms to everyone regardless of how they really learn best. This is one of the reasons that I talk about my having ADD behaviours; Idon't consider myself to be diseased1.
[1] this is going in a footnote because it's not part of the core point, but one of the things which concerns me about statements that ADD is underdiagnosed is that it is then treated as a disease. At this point the children (and this is where I become most concerned - it is almost always children) are dosed up with psychostimulants in order to make them fit in rather than training them to use their brains to their best advantage: the problem is not solved, it is avoided.
The temporal lobe controls your ability to concentrate, and is more active when a brain is concentrating on something. A typical pattern in an ADD brain is that when it is used to concentrate deliberately on something then the temporal lobe is actually deactivated (ie there is less neural activity). I say "deliberately" because a common ADD behaviour is 'hyperfocus' where the brain will concentrate on something novel1 to the exclusion of all else, but this is rarely deliberate.
Note that there is another book called "Healing ADD" by Thom Hartmann, that I would also recommend, but which is entirely different. In particular, Mr Hartmann specifically attacks Amens' work in scanning brains. But there we are.
[1] another very annoying aspect of this is that I cannot go to sleep if there is speech in earshot. I'll be drifting off quite satisfactorily when my brain will latch on to the interesting noises and amplify them in my perception. Similarly, I need silence or at least white noise if I need to think about a task which I am not entirely involved in, because otherwise my mind will concentrate on the novel rather than what I'm supposed to be doing.