http://www.sciencedirect.com/science/article/pii/S1053811911006008

Interesting findings. If this holds true for humans, it seems possible that our use of antibacterial products, etc.may be contributing to the increase in ADHD.

http://www.pnas.org/content/early/2011/01/26/1010529108

I came across this article study and thought it might be of interest:It is a study to  evaluate the association between fatty acid intake or the use of culinary fats and depression incidence in a Mediterranean population.

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0016268