Your Gut Has Its Own Nervous System
Most people think of the brain as the body’s control centre — and it is. But what many don’t know is that your gut has its own extensive network of nerve cells, often called the “second brain.” In fact, your gut contains more nerve cells than your spinal cord, and it produces over 90% of your body’s serotonin — the same chemical we associate with happiness and calm.
Your gut and brain are constantly talking to each other through a two-way communication highway called the gut-brain axis. This system connects your central nervous system (brain and spinal cord) to your enteric nervous system (your gut), using nerves, hormones, and immune signals to keep each other informed.
The result? What happens in your mind directly affects your gut, and what happens in your gut directly affects your mind.
What Stress Actually Does to Your Body
When you experience stress or anxiety — whether from a work deadline, a difficult relationship, or just the pace of modern life — your body activates its “fight-or-flight” response. Stress hormones like cortisol and adrenaline flood your system, preparing you to face a perceived threat.
This is useful in a genuine emergency. But when stress becomes chronic, the effects ripple across your entire body.
Your Digestion Takes a Hit
Blood flow gets redirected away from your digestive tract and toward your muscles and heart. Digestion slows — or sometimes speeds up dramatically — leading to familiar symptoms like bloating, nausea, cramping, constipation, or diarrhea.
Over time, chronic stress can also make your gut lining more permeable (sometimes called “leaky gut”), allowing substances into your bloodstream that would normally stay out. This triggers low-grade inflammation throughout the body.
Your Mood Suffers
Here’s where it gets especially interesting. Stress disrupts your gut microbiome — the trillions of bacteria, fungi, and other microorganisms living in your digestive tract. These microbes aren’t just bystanders; they actively help produce neurotransmitters like serotonin, dopamine, and GABA that regulate your mood.
When the microbiome is out of balance, your brain gets fewer of these calming, mood-lifting signals — and more inflammatory ones. This can contribute to or worsen anxiety, depression, brain fog, and irritability.
The real challenge? This creates a cycle: stress disrupts the gut, a disrupted gut sends distress signals back to the brain, which intensifies the stress response.
Your Pain Levels Change
Stress makes your gut and your entire nervous system more sensitive to pain. Sensations that would normally go unnoticed — like food moving through your intestines — can become uncomfortable or even painful. Chronic stress also lowers your overall pain threshold, meaning discomfort elsewhere in the body may feel amplified.
Your Immune System Feels It Too
Did you know that approximately 70% of your immune system lives in your gut? When gut health is compromised by ongoing stress, your immune defences can weaken, leaving you more susceptible to illness and slower to recover.
The Good News: You Have More Influence Than You Think
Because the gut-brain axis works in both directions, supporting your gut can improve your mood — and calming your nervous system can improve your digestion.
Some of the most well-supported strategies include:
- Stress management practices like deep breathing, meditation, yoga, or simply spending time in nature help shift your nervous system out of fight-or-flight and into “rest-and-digest” mode
- Nourishing your microbiome with fibre-rich vegetables, fruits, legumes, and fermented foods (like yogurt, kefir, sauerkraut, and kimchi) feeds the beneficial bacteria your brain depends on
- Targeted probiotic support using specific strains like Lactobacillus and Bifidobacterium has shown promise in reducing anxiety and depressive symptoms by positively influencing the gut-brain axis
- Quality sleep and regular movement both support gut diversity and a resilient nervous system
A Whole-Body Approach to Wellness
The gut-brain axis is a powerful reminder that your body doesn’t function in isolated parts. Your digestion, your emotions, your pain levels, your immunity — they’re all deeply interconnected.
If you’ve been struggling with digestive symptoms, mood changes, chronic pain, or a general sense of not feeling well, it may be worth exploring whether stress and gut health are playing a role. A naturopathic approach looks at these connections holistically, addressing the root causes rather than just the symptoms.
Curious to learn more or explore what this could mean for your health? Book a consultation to discuss a personalized plan.
Dr. Nicole Jolliffe ND
“You are the only one who gets to decide what your life will look like, and my role is to be your trusted guide and advocate. I’m here to educate, support, and empower you to create a life that brings you optimal health—one where you’re not just surviving, but thriving.”