5 ms·

Yes but the heart contains a lot of neurons so it's an interesting theory.

• culi 3y ago
  Over half of all neurotransmitters, including 80-95% of seratonin, originates in the gut. I wouldn't be surprised to hear a microbiome-based theory of personality but cellular memory is a new one to me Possibly related: it turns out horizontal gene transfer is way more common in humans than we could expect and we really don't have a good explanation for how it's happening https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5379729/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5379729/
  • hollerith 3y ago
    Over half of all neurotransmitters originates in the gut, but the barrier preventing the entry of neurotransmitters into the brain is very effective in healthy individuals. Signals from the gut to the brain arrive via the vagus nerve and probably also the other cranial nerves.
    • culi 3y ago
      Interesting! The way I've often heard it is that "over half of neurotransmitters originate in the gut" — making it sound like it's talking about the neurotransmitters already at the brain. Do you have any citations that could clarify this?
      • hollerith 3y ago
        I probably learned that fact from an episode of neuroscientist Andrew Huberman's podcast--more likely than not episode one: https://youtu.be/H-XfCl-HpRM https://youtu.be/H-XfCl-HpRM
      • tux3 3y ago
        Neurotransmitters are used all over the body. A lot is centralized in the brain, but the periphery also uses neurons and neurotransmitters. Neurotransmitters in general don't particularly imply they're being used in the brain. Some neurotransmitters travel through the body, but a larger fraction are produced locally by a cell and intended only for close neighbors.