"Some insects that have been studied have been found not to require the 
essential fatty acids. [14]*  According to reviewers, hogs and humans 
have not been shown to require the essential fatty acids. [15]  In vitro 
studies indicate that they are not required for human diploid cells to 
continue dividing in culture. [16]  According to Guarnieri, [17] 
EFA-deficient animals don't die from their deficiency.  The early 
studies showing essentiality of unsaturated fats, by producing skin 
problems and an increased metabolic rate, have been criticized [18] in 
the light of better nutritional information, e.g., pointing out that the 
diets might have been deficient in vitamin B6 and/or biotin. "

From: http://weeksmd.com/?p=851
And some more interesting stuff at:
http://groups.msn.com/TheScientificDebateForum-/fishoilquotesyoushouldread.msnw
http://raypeat.com/articles/articles/unsaturatedfats.shtml

William