They're often associated with Vitamin A deficiency (retinol). Vitamin E "deficiency" is on a case-by-case basis because the amount of Vitamin E you need is correlated with the amount of PUFA you consume. The higher your SFA:PUFA ratio, the less Vitamin E you need since your body draws Vitamin E out of storage to keep PUFA from polymerizing upon ingestion.
Originally Posted by Neckhammer
I strongly doubt any association at all with a "deficiency" in EFA's - mainly because there is no information showing they are necessary at all. Cod liver oil is extremely high in Vitamin A from retinol, so omega 3/6 is likely just a confounding factor there. If you were to give your son retinol from healthier sources like egg yolks or pastured dairy, it would probably be much safer. It's likely the "megadose" of vitamin A that did the trick, but there is definitely a law of diminishing returns.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.