Another quote from the expert on fats, D.F. Horrobin, "AA (Arachidonic
acid) can be synthesized from the dietary EFA linoleic acid, and DHA
(Docosahexaenoic acid) can be synthesized from dietary ALA...however, in
many mammals, including humans, these reactions are slow and rate
limiting." He goes on to say that preformed AA is best obtained from
animal sources.
My best, Ellie