Read Atom Bergstroms books on yellow fat disease.Several lines of evidence suggest that polyunsaturated fatty acids (PUFAs) play a role in myelination. Unsaturated fatty acids are essential constituents of all cell membranes, and the myelin sheaths around axons are formed from the membranes of oligodendrocytes.
This does not mean that all PUFAs are necessarily good or bad. But based on all of the evidence O6 is indisputably harmful while O3 can exert some positive effects.
Are there any interviews I can listen to where Peat discusses his stance on DHA in-depth?