Omega-3 Fatty Acids
Introduction
Omega-3 fatty acids are an essential fatty acid. Below paragragh taken from Answers.com Any of several polyunsaturated fatty acids found in leafy green vegetables, vegetable oils, and fish such as salmon and mackerel, capable of reducing serum cholesterol levels and having anticoagulant properties.

Benefits for the Brain
The brain is made up of a variety of cells that make up it's bulk. The neuron is one of these cells and these kinds of cells have a sheath around them that acts kind of like the plastic covering of an electical wire. Omega-3 fatty acids are a key building block of these sheaths called "Myelin Sheaths".
Peripheral Body Brain benefit

Omega-3 fatty acids have anticoagulant effects. This means that this fatty acid reduces blood clotting which contributes to easier blood flow and general heart health. Easier blood blow would be benefitial for getting oxygen to the brain easier. Anticoagulant properties can also contribute to lower risks of stroke by smoothing the flow through arteries and veins of the brain.

Foods High in Omega-3 Fatty acids

Vegetables

Purslane(an abundant weed)

Meats

Fish

Other benefits - Foods with Omega-3 Fatty Acids - Suppliments Omega 3 fatty acids from algae For those who are attentive to the recent events of over fishing here is a suppliment with out fish oil using algae for a source of omega 3s.

 
External resources http://www.answers.com/topic/omega-3-fatty-acid http://en.wikipedia.org/wiki/Omega-3_fatty_acid http://www.richinomega3.com/ http://www.vegsoc.org/info/omega3.html http://www.medicinenet.com/omega-3_fatty_acids/article.htm http://www.nhlbi.nih.gov/meetings/workshops/omega3-summary.htm http://www.eurekalert.org/pub_releases/2006-03/uopm-o3f022706.php http://www.isodisnatura.net/bibliography_scientific.htm http://www.webmd.com/diet/news/20070307/omega-3-fatty-acids-may-boost-br...