Seems to have soemthing to do with one of the isomers. Also, that the body doesn't really need 3 grams of CLA to keep the metabolism chugging along. Though it does seem to do *something*
I listen to Barry Sears about these kinds of biochemical processes; he has written a lot about fish oil, arachidonic acid, chronic inflammation etc. He seems to think people should pass on CLA. Udo Erasmus and Mark Sisson think so also.