Study suggests serotonin levels are regulated by gut bacteria:
*Study suggests serotonin levels are regulated by gut bacteria*
From the article
This research has multiple health implications as it shows that
manipulations of the microbiota (e.g. by antibiotics, diet, or infection)
can have profound knock-on effects on brain function. “We’re really excited
by these findings” said lead author Dr Gerard Clarke. “Although we always
believed that the microbiota was essential for our general health, our
results also highlight how important our tiny friends are for our mental
wellbeing.”
Dr. Brian Grady's blog 
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