What Is Arachidonic Acid?
Arachidonic acid is a major essential (must have/can’t make) omega-6 fatty acid.
Structurally, arachidonic acid  is a key component of nerve membranes, together with docosahexaenoic acid  (DHA ), a major opposing omega-3 fatty acid, making up 15-20% of the brain’s dry mass and more than 30% of the retina.
Arachidonic acid  is an important building substance for the eicosanoids.
Q: What function do the eicosanoids have that are derived from arachidonic acid ?
A: Eicosanoids are a large group of highly bioactive hormone-like substances including prostaglandins, leukotrienes, and thromboxanes that are involved in blood clotting, inflammation, and vasoconstriction. Eicosanoids derived from arachidonic acid  are pro-inflammatory, pro-blood clotting, and constrict blood vessels in opposition to those derived from the omega-3 fatty acids which do the opposite in order to keep a balance in the body.
What Is Arachidonic Acid Deficiency In Celiac Disease and/or Gluten Sensitivity?
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Rapoport SI. Brain arachidonic and docosahexaenoic acid  cascades are selectively altered by drugs, diet and disease. Prostaglandins Leukot Essent Fatty Acids. 2008 Sep-Nov;79(3-5):153-6. Epub 2008 Oct 29. ↩ 
Richardson AJ. The importance of omega-3 fatty acids for behavior, cognition, and mood. Scandinavian Journal of Nutrition. 2003;47(2):92-8. ↩