The problem is the same in the UK. A sudden explosion of children being diagniosed as having 'ADHD' and being given a drug called Ritalin, which is a stimulant, in order to make them concentrate on things such as schoolwork. Schools now have more difficulty teaching children who are of course mostly eating more processed foods and sugars, especially HFCS, but probably a whole host of chemicals that 20 years ago were not present in our diet. Where children come from slightly more affluent backgrounds, parents tend to make better food choices and the levels of classroom disruption will be lower, which is not to say that the classroom system is ideal for a human being, but clearly indicates where the problem lies. The chef Jamie Oliver has done about as much as is humanly possible to campaign on this issue and is to be commended. Despite what he has acheived its still widespread practice to medicate children. In our culture in general is would be taboo to approach a child's parent and question them on what the child is being fed, even as a medical professional, so they are being given medication instead.
Hopefully in the future culture changes will allow a more realistic treatment of a child's behaviour which is centered around diet as the first consideration.
I disagree that the medical profession is completely corrupt and to blame, we need to draw a distinction between their ability to treat 'communicable' illness such as diseases and viruses, which clearly they do well, and their faliure to treat 'non-communicable' diseases such as heart disease, diabetes, depression, etc which are the longer term conditions more related to what we consume as a society.