Since EFAs are called ESSENTIAL fatty acids, the bottom line is that we cannot live without them.

Whether they will cure or control a condition already present, is very difficult to prove, because of the many variables people have when chosen for study subjects. Nutritional studies are always difficult to substantiate.

But since we cannot live without EFA's ...a certain amount daily should be in your food choices, and if not, you need to supplement them. There are global benefits besides psychiatric ones... strengthening the membranes lining your lungs, your retina, your stomach (they can help prevent and control GERD)
and improving immune functions to reduce overactivity and autoimmune reactions.... EFAs should be a considered part of your diet and or supplement routine IMO.

For what it is worth, the higher DHA types (we used Carlson's DHA) enabled my son to go off Ritalin and clonidine for his ADHD. So I started using EFAs in our home over a decade ago!
I have a thread about them on our Vitamin forum.
I used to get flamed constantly when I posted this information on BT... by the internet bullies who used to post there BTW.

http://neurotalk.psychcentral.com/showthread.php?t=6092