Gut-Brain Axis: What Your Second Brain is Whispering

In English, intuition is often called a ‘Gut Feeling’. Everyone has probably had the experience of their stomach twisting or feeling “off” for some reason before an important decision. While the ancients saw this as a spiritual realm, modern science is revealing that this intuition actually begins in our Gut.

I. The Second Brain: Enteric Nervous System (ENS)

Over 500 million neurons are densely embedded in our gut, the digestive organ. This is a larger number than in the spinal cord, and because the gut can operate independently without instructions from the brain, it is called the ‘Second Brain’.

The most surprising fact is that about 95% of serotonin, known as the happiness hormone, is produced in the gut, not the brain. In other words, the psychological peace or anxiety you feel reacts more sensitively to the state of your stomach than to the thoughts in your brain.

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II. Gut Microbes: Invisible Controllers

The trillions of microbes (Microbiome) living in our gut are not just assistants aiding digestion. They directly synthesize neurotransmitters and exchange signals with the brain thousands of times per second via the Vagus Nerve.

• Will of the Microbes: When there are many beneficial bacteria, it is easy to have positive and open thoughts, but the proliferation of certain harmful bacteria can induce anxiety, depression, and even aggressive tendencies.
• Food and Personality: The saying “You are what you eat” is a biological truth. This is why the abuse of antibiotics or the consumption of processed foods goes beyond simple health problems and changes one’s ‘attitude toward life’.

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III. How is Intuition Formed?

The intuition we feel as “this path is dangerous” is the result of the gut first detecting biochemical signals and shooting them up to the brain before the brain analyzes past data.

1. Detection: The gut’s neural network detects subtle electromagnetic changes or biochemical signals in the surrounding environment.
2. Signal Transmission: It sends immediate signals to the brain’s emotional centers (such as the amygdala) through the vagus nerve.
3. Reaction: The brain does not know why, but it reaches an emotional conclusion of “feeling off” or “feeling good.”

Conclusion: Listening to the Inner Voice

Modern society overemphasizes the logical thinking of the brain. However, our instincts and intuition are constantly sending us signals through the massive information center that is the gut.

• Respect your gut feeling: If you feel an unexplained discomfort, set logic aside for a moment and carefully examine that signal.
• Take care of your gut: Consuming healthy food and enriching the ecosystem of gut microbes is never just simple health management; it is increasing the resolution of your wisdom and intuition.

If you want clear insight, you must first reconcile with your stomach.