Have you ever wondered why we use the expression"gut feeling"?
Last month, we explored the power of visualization and setting an intention (you can read it here). A key aspect of this practice is tuning into your intuition—that deep inner knowing often described as a "gut feeling." But have you ever wondered why we use this expression? Why do emotions seem to stir in our stomach, and why do we say things like "butterflies in the belly" when we’re nervous or excited?
Science has been uncovering just how deeply intertwined our gut and brain really are, and a major player in this connection is the vagus nerve—the longest cranial nerve in the body, directly linking the brain and gut.
The Fascinating Shared Origin of the Gut and Brain
To truly understand this connection, we need to go back to the very beginning—before we were even born. In the early stages of embryonic development, the first structures that form include a simple tube of cells that will eventually differentiate into two critical systems:
The central nervous system (which includes the brain and spinal cord)
The enteric nervous system (which governs the digestive tract).
This means that our gut and brain literally come from the same cluster of cells. While they take on different functions, they remain in constant communication throughout our lives. This shared origin explains why the gut is often called "the second brain"—it has its own independent nervous system capable of processing information, responding to stimuli, and even influencing our emotions.
The Second Brain and the Microbiome
The digestive tract has an astonishing number of neurons—around 500 million—lining its walls. This is known as the enteric nervous system (ENS), and it functions much like an independent brain within the gut. These neurons control digestion, regulate immune responses, and even influence mood.
About 90% of serotonin—the neurotransmitter responsible for happiness and well-being—is produced in the gut, not the brain.
This is why gut health plays a major role in mental health. When your gut is out of balance, it can disrupt serotonin production, potentially leading to increased stress, fatigue, or even depressive symptoms.
Besides the astonishing number of neurons, there is also another large community living in the gut: trillions of bacteria, fungi, and other microbes, forming what is known as the gut microbiome. These microbes aren’t just passive passengers; they actively participate in digestion, immune defense, and even brain function. Some gut bacteria produce neurotransmitters like dopamine and serotonin, directly influencing your mood and cognitive function.
Scientists have found that changes in the gut microbiome can impact mental health conditions like anxiety and depression.
For example:
An imbalance in gut bacteria has been linked to increased stress responses.
A healthy microbiome supports resilience against stress and emotional regulation.
The Gut-Brain Axis: A Two-Way Street
The gut and brain communicate through the gut-brain axis, a complex network of neurons, hormones, and biochemical signals. Think of it as a two-way street where messages are sent back and forth all the time.
One of the most crucial pathways in this communication is the vagus nerve. The vagus nerve acts as a superhighway, carrying messages in both directions:
From the brain to the gut, helping regulate digestion, metabolism, and even inflammation.
From the gut to the brain, sending information about the state of digestion, gut bacteria, and overall well-being.
When you experience stress, the brain signals the gut via the vagus nerve, potentially leading to cramping, bloating, or discomfort. But the gut also sends signals back to the brain, which is why an imbalance in gut bacteria or poor digestion can impact your mood, focus, and emotional resilience.
Ever felt your stomach clench when you're anxious or had digestive issues during stressful periods? That’s the gut-brain connection in action.
Stress triggers the release of cortisol, which not only affects mood but also reduces vagus nerve activity, slows down digestion, and alters gut bacteria balance.
Chronic stress can contribute to conditions like Irritable Bowel Syndrome (IBS), acid reflux, and bloating. A study published in The Journal of Physiology shows how stress impacts the gut-brain axis, increasing the risk of gastrointestinal disorders.

What you can do
The gut-brain connection is a reminder that our physical and emotional well-being are deeply intertwined. Taking care of your gut health can help support mental clarity, emotional balance, and overall vitality. Here are a few ways to nurture both:
Stimulate the Vagus Nerve: Deep breathing, yoga, and meditation activate the vagus nerve, reducing stress and improving digestion.
Eat a gut-friendly diet: Prioritize fiber-rich foods, fermented foods (like yogurt, kimchi, and sauerkraut), and prebiotic foods (like garlic and bananas) to support a healthy microbiome.
Get enough sleep: Poor sleep can disrupt gut bacteria balance and increase inflammation. Aim for quality rest to support both brain and gut health.
Stay hydrated: Water helps digestion and keeps gut functions running smoothly.
Limit processed foods & sugar: These can contribute to inflammation and disrupt the microbiome balance.
Trust Your Gut—Literally
Next time you have a "gut feeling," don’t ignore it.
Science is now proving what ancient traditions have long believed—our intuition isn’t just in our heads; it’s deeply rooted in our bodies, particularly in the gut.
Learning to listen to our inner signals, nourish our microbiome, and manage stress can create a profound shift in both physical health and emotional well-being.
Here is a short practice on how to set an intention without ignoring your gut feeling.
What’s your experience with the gut-brain connection? Have you ever noticed how stress or emotions affect your digestion? I’d love to hear from you!
And if you’re curious about how to balance your nervous system and digestive health through movement and mindfulness, book a free discovery call with me. Let’s explore ways to support your well-being together!
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