I really worried about this on a hospitalization earlier this year when I was given so much antibiotic that my gut was seemingly completely reset to the null st

I really worried about this on a hospitalization earlier this year when I was given so much antibiotic that my gut was seemingly completely reset to the null state.* That is, I was quite worried that something unpleasant would take it as an invitation to colonize my gut instead, so I ate a LOT of live culture yoghurt. Quite unpleasant when you can't digest anything properly (I'll spare the details) but I rapidly recolonized my gut and restored things to working order. The disturbing sequela was that my interest in certain foods after this process was quite different from my interest before I was sick. It makes me wonder if I ever wanted a donut (or coffee) or if it was some other species signalling to my brain that I wanted to eat such a thing. Nowadays I have little interest in such things. * surely not reset completely to 0. And while I didn't want that to happen I am super glad I got those antibiotics!