"gut feeling"
What does that mean? It means your body is telling you something.
Two examples:
Anxious brain => bad gut
It's true, an anxious brain can kill good gut bacteria and help send you into a downward spiral.
Happy gut => healthy brain
A functioning gut biota is necessary to produce your hormones like dopamine or serotonin to keep you balance and feeling good.
Concluding
Probiotic are proven to support a disfunctional gut brain axis in many ways
All is connected
https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2024.1348297/full