Due to the changes in our culture over the last century it seems our diets <and a great many other things have changed>. However, I found it interesting the studies developing regarding Omega 3 And Omega 6 especially those studies concentrating on children with Add and ADHD.
Book Recommended by RN friend seems to have same suggestions:
http://www.amazon.com/exec/obidos/tg/detail/-/0684871386/qid=1052512827/sr=1-2/ref=sr_1_2/002-6895557-4536844?v=glance&s=books
Book Description
For years scientists have searched for a "magic bullet" to relieve the pain of depression and other mood disorders -- safe enough for nursing mothers, children with ADHD, and the elderly, without the side effects associated with medicines like Prozac, Zoloft, and lithium. Now the search may finally be over, thanks to the Omega-3 Renewal Plan, introduced here by Andrew L. Stoll, M.D., Director of the Psycho-pharmacology Research Laboratory at Harvard's McLean Hospital.