Your vagus nerve is the one delivering messages from your gut to your brain.

Your vagus nerve is the one delivering messages from your gut to your brain.

He's responsible for parasympathetic nervous system activation.
He's the one telling your brain that everything is ok, That the gut is digesting and your environment is beneficial.

Sympathetic signals usually run thru the spinal chord.

In a metabolic view it's quite parallel to oxidative metabolism with high thyroid and Androgens/Progesterone compared to stress metabolism driven by cortisol and serotonin.

This study shows how cortisol lowers vagus tone.

DOI 10.1371/journal.pone.0105328