Emeran Mayer: Gut Influences Mental Health - Second Brain | Mindfulness Exercises

Emeran Mayer: Gut Influences Mental Health – Second Brain

Neuroscientists now think of the gut as a “second brain”; it independently controls your digestive processes and is in constant conversation with your main brain.

The Mind-Gut Connection is something that people have intuitively known for a long time but science has only I would say in the last few years gotten a grasp and acceptance of this concept. It essentially means that your brain has intimate connections with the gut and another entity in our gut, the second brain, which is about 100 million nerve cells that are sandwiched in between the layers of the gut. And they can do a lot of things on their own in terms of regulating our digestive processes. But there’s a very intimate conversation between that little brain, the second brain in the gut and our main brain. They use the same neurotransmitters. They’re connected by nerve pathways. And so we have really an integrated system from our brain to the little brain in the gut and it goes in both directions.

The little brain, or the second brain, in the gut you’re not able to see it because as I said it’s spread out through the entire length of the gut from your esophagus to the end of your large intestine, several layers of nerve cells interconnected. And what they do is even if you – and you can do this in animal experiments if you completely disconnect this little brain in the gut from your main brain this little brain can completely take care of all the digestive processes, the contractions, peristaltic reflex, regulation of blood flow in the intestine. And it has many sensors so it knows exactly what’s going on inside the gut, what goes on in the wall of the gut, any distention, any chemicals. All of this is being picked up by these sensory nerves, fed into the interior nervous system, the second brain. And then the second brain generates these stereotypical responses. So when you vomit, when you have diarrhea, when you have normal digestion, all of this is encoded in programs in your second brain.

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