The odd thing is that me and other people here had mentioned that PN started after losing weight, so it might seem that the weight loss could be somehow trigger it .
As I said in another thread, could it be that the losing weight disrupts the balance that the organism used to have about glucose handling because, say, now glucose gets higher because it has to be shared by a smaller body than before? less cells to feed? or there are now less adipocytokines andso the metabolism gets altered?
Pure speculation, but hey, if I know one thing is that biology is all about checks and balances.
(No that I would suggest trying to gain weight again to see if one restores the balance..).

Of course, it could be just a coincidence, no relation whatsoever, we were going to develop PN anyway, regardless of the weight loss.