I've never found it to have any obvious effect. Repeatable n=1 results are certainly useful to the individual. When you look at mechanisms--saying that it doesn't seem to be generally true that linoleic acid intake determines arachidonic acid/inflammatory metabolites of arachidonic acid levels in people isn't the same as saying that it's impossible for this to be true in individuals. Arachidonic acid from linoleic acid is usually limited, for the same reason dha from alpha linolenic acid is limited, the same enzymes are involved, just as some people can produce enough dha from flaxseed that they might not need it preformed in the diet, the same could be true of arachidonic acid.

edited; typed linoleic instead of linolenic.