Good Housekeeping Magazine
... She's not ready to make the next leap, to link iron deficiency to
attention deficit disorder. "A lot of people are asking that question" about ADD.
...
http://magazines.ivillage.com/goodhousekeeping/hb/news/article/0,,knightridder_2003_10_08_krtbn_0000-0119-DE-DIETARY-IRON~ew~xml,00.html

There are two types of iron -- "heme" and "non-heme"......

"Heme" iron is the one that is most easily absorbed in the body....and food sources include: meat, fish, poultry, eggs, dried beans, broccoli, peanut butter, nuts, seeds, etc.

"Non-heme" iron is not so easily absorbed and is found in most grains......and dark green leafy veggies.....To get this type of heme better absorbed, eat with a good vitamin "C" source such as oranges, strawberries, cantaloupe, baked potatoes, peppers, etc.

The tricky thing with all iron absorption is that so many other constituents in food block its absorption. Caffeine for one does.....Calcium does as well.....That is why big-time milk drinkers tend to be anemic.....

This article is pretty good in my opinion....it talks about how iron regulates dopamine...which may be true....but I think the importance of iron lies in the fact that it is directly involved in the oxygenation of ALL types of blood cells and nerve cells and tissues and organs.....(as it is part of the protein molecule, hemoglobin....the oxygen carrying protein in the blood).....

And without adequate oxygenation, the nerve cells and neurotransmittors don't function as well.....that is what I believe is the link between iron deficiency and ADD.....