Blog Post 3: Your Gut Has a Brain. So Does Your Heart.
Gut feeling. Heartfelt. Broken heart. We use this language so often we've stopped noticing it isn't just a figure of speech.
Your gut has its own nervous system, sometimes called the second brain. It's a network of neurons lining your digestive tract, structured surprisingly like the brain itself, and while it stays in contact with your brain via the vagus nerve, it can also run digestion and absorption largely on its own. It's in constant two way conversation with your gut microbiome too, your bacteria influence your gut's movement, secretions and local immune activity, and your gut's nervous system shapes the environment your bacteria live in right back.
Your heart has something similar, a small but real network of neurons that can sense, process and respond to information on its own, though it still needs the brain to function fully. It plays a real role in regulating heart rate and rhythm, and it communicates upward in ways that influence cognition, emotional state and stress response. Interesting, given how instinctively we've always spoken about the heart as the seat of feeling.
All of this sits under a wider system called the autonomic nervous system, split into two branches, sympathetic (fight or flight) and parasympathetic (rest and digest), which need to stay in balance. When they don't, and one branch, usually the sympathetic side, runs the show more than it should, the effects touch digestion, immunity, mood and sleep all at once.
This is also why early stress and trauma matter clinically, even years or decades later. Chronic early stress can shift how reactive someone's stress response system is for life, alter their baseline nervous system tone, and change how their immune system and microbiome behave. It's part of why two people can eat almost identically and respond completely differently, their nervous systems are running different programmes underneath.
In Chinese medicine, the Heart is said to house the Shen, our mind and spirit, and digestion is closely tied to the Spleen's ability to hold and process, physically and emotionally. A lovely, old confirmation of something we're only now mapping in Western physiology.
Ways to support this system day to day:
Vagal toning practices, humming, gargling, singing, even cold water splashed on your face
Slow, well paced breathing if you tend to breathe shallow or high in the chest
Time in nature, barefoot contact with the ground has been shown to lower cortisol and inflammatory markers
Noticing where stress shows up in your body, not just your thoughts
If your gut, sleep or stress resilience have felt stuck for a long time, it's often this deeper layer that needs attention, not just the symptom on the surface. Acupuncture is really amazing at looking at the whole picture together, book in now.