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Lisa Newberry

The gut-brain-cold water connection

Our incredible human body never ceases to amaze, and one of its most fascinating connections is the one between our gut and our brain! At the heart lies the vagus nerve, the 10th cranial nerve, serving as a vital pathway that links our gut and brain in a two-way conversation. This extraordinary pathway, known as the gut-brain axis, has a profound impact on our mood and emotional well-being. How can the vagus nerve and cold water swimming contribute to a healthy gut and balanced emotions?


The gut-brain axis

Imagine a bustling network where the gastrointestinal tract and the brain exchange constant messages – that's the gut-brain axis in action! This incredible pathway involves neural, hormonal, and immune signalling mechanisms, all orchestrated by the vagus nerve. Information travels up from the gut to the brain via the vagus nerve, while signals from the brain journey down to influence gut function. It's a dynamic, never-ending conversation between these two essential players.


How does the gut influence the brain?

Our gut, often fondly called the "second brain," boasts an impressive array of neurons, neurotransmitters, and receptors, allowing it to function independently from the central nervous system. This gut-brain relationship produces a whole range of neuroactive substances, like serotonin and dopamine that play a significant role in shaping our mood and emotional well-being. It's no joke when we say a good meal can lift our spirits – about 95% of the body's serotonin, the "feel-good" neurotransmitter, is made in the gut.

The gut is home to trillions of gut microbiota and these incredible microbes work tirelessly to maintain gut health and exert a remarkable influence on the gut-brain axis. They produce neurotransmitters, vitamins, and short-chain fatty acids, all of which have a direct impact on our mental state. When our gut ecosystem is in a state of balance, it makes us feel better.


The vagus nerve: bridging the gap

Enter the vagus nerve – the star of this gut-brain show. Acting like a bridge connecting our gut and brain, the vagus nerve ensures smooth communication between the two. When our gut is happy and content, the vagus nerve helps keep things running smoothly, ensuring among other things, easy digestion.  But watch out for imbalances or irritation – when this occurs, the vagus nerve quickly alerts the brain, potentially leading to mood disturbances and emotional turbulence.


And here's the link with cold water swimming. Cold water swimming has a secret way of giving your vagus nerve a gentle nudge. The moment you splash cold water on your face, the vagus nerve springs into action, activating the diving reflex. This response helps promote a state of calm and conserves oxygen in your body. The cold water invigorates your vagus nerve, which benefits both your gut and brain.


A well-functioning vagus nerve and gut health

Maintaining a happy and healthy gut-brain axis relies heavily on a well-functioning vagus nerve. With the vagus nerve in top form, it regulates the movement and contractions of the muscles in the gastrointestinal (GI) tract, particularly in the stomach and intestines, ensuring smooth digestion and nutrient absorption. It also acts as a gatekeeper, guarding the gut barrier to prevent harmful substances from causing inflammation.

A well-balanced vagus nerve helps stabilise the autonomic nervous system, with the parasympathetic branch promoting relaxation and restorative processes. This balance is essential for managing stress and reducing the production of stress hormones like cortisol, which could negatively impact gut health when out of control.


Practical tips for nurturing the gut-brain connection

  1. Mindful eating: Take time to savour each meal, not easy when you’re really hungry! But mindful eating promotes better digestion and nutrient absorption.

  2. A feast of balance: Embrace a colourful variety of whole foods, including fruits, vegetables, whole grains, and those gut-loving fermented delights.

  3. Stress-busting getaway: Escape stress's clutches with relaxation practices like meditation, deep breathing, yoga, or soul-soothing nature walks.

  4. Gut microbe party: Invite probiotics to the celebration through foods or supplements, and don't forget to feed them prebiotics to keep the party going.


Or do what I do and find a group to go cold water swimming with! When you immerse yourself in cold water, your vagus nerve springs into action and you feel that cold water 'buzz'… once you get used to the cold that is! The motto of the group of friends I swim with is ‘It’s fine once you’re in!’ and it really is!


If you fancy having a cold water swim or dip, check out the Watchtower Waders on facebook and make 2024 the year you help out your gut-brain axis!

 




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