It has now been shown that certain types and styles of gut bacteria strongly affect production of serotonin, which has a known effect on moods.
"Damn! he's fed us a McDonalds hamburger again. I say, lets drive the bastard into a low serotonin depression."
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"Damn! he's fed us a McDonalds hamburger again. I say, lets drive the bastard into a low serotonin depression."
Food Navigator