Hey Twitter, what do we know about gut bacteria? How is it connected to our health and mood and what we eat? I keep hearing little snippets of conversation but don't feel like I know anything other than "eat yogurt!"
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random anecdote
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TIL 90% of the human body's total serotonin is located in the GI tract, ie your gut
there's some association between IBS and serotonin fuckery
... the "happy hormone" is stored in the ass 
en.wikipedia.org/wiki/Serotonin
en.wikipedia.org/wiki/SerotoninShow this thread
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hmmm
my ex had the lowest "happiness set point" of anyone I know who wasn't clinically depressed
...and he had *horrible* GI issues
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they're very correlated in my experience!