There is certainly lots going on inside, loads of areas of study at the monment look at gut-brain axis (GBA) and stuff like 'Gut bacterial taxonomic abundances

There is certainly lots going on inside, loads of areas of study at the monment look at gut-brain axis (GBA) and stuff like 'Gut bacterial taxonomic abundances vary with cognition, personality, and mood in the Wisconsin Longitudinal Study' https://www.sciencedirect.com/science/article/pii/S2666354620301204 https://www.sciencedirect.com/science/article/pii/S266635462... 'Highlights • Multiple families, genera, and species were associated with psycho-cognitive traits. • Megamonas is associated with cognition, mood, and personality. • Pseuroramibacter_Eubacterium is associated with mood and personality. • Fusobacterium is associated with personality and cognition. • Butyrivibrio is associated with cognition.' Edit: just to add I'm a layperson so not able to asses the quality of this study, if someone is more able to do that I would welcome the input.