Yes FOS and Inulin are closely related. Can't remember what the exact difference was to be honest.. but yep they are similar.

I too had issues with both FOS and Inulin containing foods like onion and garlic. However I found that by gradually adding a tiny amount and doubling it every few days I was soon able to acclimatise my gut to foods that naturally contain it (mainly garlic and onion).

But for whatever reason I still had problems when FOS / Inulin had been added artificially - as in yoghurt and probiotics. I am guessing that the artificial kind is just too much for my body or ferments too easily?

what I can eat on the diet (click here) -- my blog -- contact me (PM is broken)
"Some men, in truth, live that they may eat, as the irrational creatures, 'whose life is their belly, and nothing else.' But the Instructor enjoins us to eat that we may live." -- Clement of Alexandria (about 200 AD)