David_Gerard comments on A sense of logic - Less Wrong
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http://en.wikipedia.org/wiki/Enteric_nervous_system
It's about 100 million neurons. (Compare 1000x that in the brain.)
The more interesting question is whether the strong emotions do indeed cause discomfort in the gut.
I've also been told that trauma for the stomach can effect the emotional state, and I can personally attest to feeling distressed, then eating a good sized meal and feeling better afterwords; Also connecting with fast food and eating disorders.
But this could also be an old wives tale, and I'm suffering from a placebo effect.
I was under the impression (I don't recall from where) that this was due to the effect of blood sugar levels on mood. No evidence for this other than that I become irritable when hungry, but it's an alternative explanation.