The Gut‑Brain Axis Explained

The Gut‑Brain Axis (Why Your Stomach Has Feelings)

The Second Brain in Your Gut

You have a “second brain” in your digestive tract, called the enteric nervous system. It contains over 100 million nerve cells—more than your spinal cord. Your gut and your brain are connected by the vagus nerve, a long, wandering nerve that acts like a dedicated phone line. And here’s the kicker: about 80–90 percent of the traffic travels upward, from your gut to your brain.

So when your gut is unhappy—inflamed, imbalanced, struggling to digest—it sends distress signals up that line. Your brain receives them and thinks, “Something’s wrong. Sound the alarm!” Suddenly you’re anxious, even if nothing in your life is actually threatening.

Meet Your Microbiome

Your gut is home to trillions of bacteria, fungi, and other microorganisms. Collectively, they’re your gut microbiome. Think of them as little roommates. Some are lovely, tidy, and supportive. Others are noisy, messy, and stressful. When the balance tips towards the unruly ones (a state called dysbiosis), your gut lining can become inflamed, and those distress signals get louder.

What Upsets the Roommates

  • Chronic stress (itself changes your microbiome)
  • Highly processed food and sugar
  • Antibiotics (sometimes necessary, but they nuke the good guys too)
  • Lack of sleep
  • Alcohol and caffeine

How to Make the Chat Friendlier

You don’t need to be a wellness influencer. Small, gentle changes can help your gut and brain get along better:

  1. Eat more plants: Fibre from vegetables, fruits, legumes, and whole grains feeds the good bacteria. Variety is key.
  2. Try fermented foods: Yoghurt, kefir, sauerkraut, kimchi, and miso contain live probiotics. Even a few times a week can nudge the balance.
  3. Move gently: A short walk after a meal aids digestion and lowers stress.
  4. Manage stress (I know, I know): The same things that calm your brain—breathing, grounding, gentle movement—also calm your gut.
  5. Hydrate: Water keeps everything moving and supports a healthy gut lining.

The Direct Link to Anxiety

If you’ve ever had “butterflies” before a stressful event, you’ve felt the gut‑brain axis in action. That connection is why supporting your digestive health can genuinely lower your baseline anxiety. It’s not a cure, but it’s a powerful, under‑used tool.

That’s why I created a whole section of gut‑friendly recipes on this site. Food isn’t just fuel; it’s a signal to your nervous system. Feed it kindly.