People focus less on bad feelings and experiences from the past after taking probiotics for four weeks.
Adam Rifkin stashed this in Microbiome
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The gut is full of neurotransmitters. People with IBS-D tend to feel like crap (heh) when they're having a flareup, and it's not just because they have diarrhea. It's not all that surprising that this could have an effect.
Study where they gave fecal transplants from really happy people to really melancholy people:
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