I had many unpleasant experiences with zero calorie sodas, especially if I started to consume them regularly. Belching, farting, reflux etc. Those always went away when I stopped. (I do not drink sugary sodas at all.)

So it wasn't as surprising for me to learn that there are suspicions that artificial sweeteners may alter gut biome.

There isn't any consensus yet, but my N==1 seems to agree with the suspicion. I am generally fairly sensitive to gut biome changes, even a few weeks on a different probiotics might change e.g. my sensitivity to milk.

https://www.mdpi.com/1422-0067/22/10/5228

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8156656/

https://www.nature.com/articles/nature13793