The Second Brain describes the substantial amount of nervous system needed to run the digestive tract.
For example, stomach acid dissolves meat. How do you manage to avoid digesting yourself? Partly, there’s a chemical reaction which makes stomach acid outside of your cells, and there’s also base to neutralize the acid on the way out of your stomach- and it has to be made in the right amount at the right time.
As I recall, the book doesn’t include the effect of emotions on all this- explaining the system without including emotions is complicated enough. It does suggest that some ailments which are attributed to the organs might actually be problems with the neurological control system.
I haven’t seen anything recent about this because the attention has been going to the microbiome. Has anyone seen something more recent than 1999?
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