They say the gut is the root to all problems. so you naively took antibiotics plus roaccutane and other other meds to cure your acne from age 13 to 19. as well as having a diet full of rubbish and junk.. that killed all the good bacteria in your body. so you develop initially IBS then IC then finally MS.
but then on the other hand no one has perfect diet.. at some point people take medications for various things. I do not have any genetic link either so what is it..
... and the ones that won't