 Inflammation isn't always bad. When you get a splinter or cut yourself, the wound can get all red, hot, swollen, painful, pussy. Inflammation is one way our bodies fight off infection. So we do need some arachidonic acid to trigger the inflammatory cascade, but we don't need to eat any since our bodies make all we need. Our carnivores like cats, arachidonic acid, is an essential nutrient. Since they're eating animals all day, they get it preformed in their diet, so their bodies never needed to make any. We, however, evolved from plant-eating apes, and so we evolved to make it ourselves. It's like cholesterol. Our bodies need some cholesterol, so our bodies make all we need. There's no need to take an extra through our diet, and in fact too much cholesterol is a bad thing. The same thing may be true with arachidonic acid. If you want to try to stay away from the stuff, these are the top 10 sources in the American diet, as you can see overwhelmingly chicken and eggs. So even semi-vegetarians can drop their levels down, though one would have to eat vegan to optimally minimize one's intake.