I've a theory about the NSD. I have found it pretty helpful but am on the 'journey' shall we say.......
I think that whole grains and so on could be the worst things because they reach the lower gut where those Klebsiella reside due to the lovely long lasting slow digestion. Meanwhile quick use starches-wonderfully over-processed crap that we are always normally told to cut down on- can be tolerated from time to time IF you are really hungry and digest and absorb them BEFORE they get to the lower gut!!!!
I thought this after a morning of enforced fasting (ie. there was nothing I could eat around the house that had no starch) then being offered a Krusty Creme doughnut, which I accepted. I waited for the pain and none came!!!