^^^^^^^ THIS
More and more research is being done into how important the gut/brain connection is.
Processed foods also strip out all the insoluble fiber that alot of these gut flora rely upon.
Not just gut flora, but lower intestine flora as well.
I have been supplementing with probiotics and adding more varied types of fiber to try and encourage gut health. Lots of Anons swear that Kombucha works extremely well, but I can't get past the smell so I haven't tried it yet.
Gut health also effects OBESITY and MENTAL HEALTH.
"The Gut-Brain axis: The influence of Microbiota on Mood and Mental Health".
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6469458/
"The Gut Microbiome and Brain Health"
https://depts.washington.edu/mbwc/news/article/the-gut-microbiome-and-brain-health>>8828591
"New Link between gut bacteria and obesity"
https://www.sciencedaily.com/releases/2018/02/180223092441.htm