Although I loved keto while I was doing it (around 4 years), I am now having some digestion issues & food sensitivies that I think is caused by my gut biome getting messed up because I wasn't feeding it.  Our microbiome needs some carbs, even if it is just fiber that we can't digest, in order to stay alive.  Taking a little bit of probiotics while doing keto may be a better idea.  I'm not sure.