Gut–brain connection and what it means for your health

We often think of the brain as being in charge of our bodies. But when it comes to your health, your gut has a lot more say than you might expect.

That sluggish, low-energy feeling after a run of takeaway meals? Or the lift in mood when you’re eating well? That’s not just coincidence — it’s your gut and your brain in constant conversation.

Scientists now understand that this relationship is a two-way communication system, and it plays a major role in how we feel, think and function every day.

What is the gut–brain connection?

The gut and brain are linked by what’s known as the gut–brain axis — a complex communication network that connects your digestive system and your central nervous system.

This connection works in several ways:

• Physically, through the vagus nerve, which carries signals between the gut and the brain
• Chemically, via neurotransmitters such as serotonin and dopamine — many of which are produced in the gut
• Neurologically, through the enteric nervous system — often called the body’s “second brain”, with more than 100 million neurons

Importantly, this isn’t a one-way street. While we used to think the brain was calling the shots, research now shows the gut is sending the majority of signals.

So, how does your gut health impact your mental health?

Your gut is constantly sending updates to your brain about what’s happening in your body — from the nutrients you’re absorbing to how your immune system is functioning.

When your digestive system is out of balance, those signals can start to affect how you feel.

That’s why people with ongoing gut issues — such as bloating, constipation, diarrhoea or conditions like IBS — are more likely to experience anxiety or low mood.

There’s also emerging evidence that gut health may influence cognitive function, including memory and focus.

What you can do to support both gut and mood

Supporting your gut is one of the most practical ways to support your mental wellbeing. Small, consistent habits can make a real difference:

• Eat a wide range of whole foods to nourish your microbiome
• Include fermented foods such as yoghurt, kimchi, sauerkraut or kombucha
• Aim for balance — carbohydrates, protein and healthy fats at each meal
• Add colour to your plate — a variety of fruit and vegetables supports diversity in gut bacteria
• Prioritise fibre — both soluble (fruit, oats) and insoluble (whole grains, nuts, seeds)

This is where breakfast can quietly do a lot of work. A bowl of real wholefood muesli — grains, nuts, seeds, no filler — gives your gut something worth working with. It's why so many of my customers tell me their morning breakfast of Te Atatū Toasted keeps them full until lunch. Not because of a health claim on a box, but because of what's actually in it.

One blue scoop (or 3 tablespoons). Real ingredients you can read. That's it.

How does your brain affect your gut?

Remember, the conversation goes both ways.

Have you ever felt “butterflies” before a big moment? Or a knot in your stomach when you’re stressed? That’s your brain talking to your gut.

Stress, anxiety and even excitement can trigger very real physical responses in your digestive system, including:

• Changes in digestion speed
• Nausea or discomfort
• Flare-ups of conditions such as IBS

Even thinking about food can trigger digestive processes — your brain signals the stomach to release juices before you’ve taken a bite.

When stress becomes ongoing, it can disrupt digestion more consistently, making it harder for your body to absorb nutrients and maintain balance.

What you can do to support your gut via your brain

Looking after your mental wellbeing is also key to maintaining a healthy gut:

• Eat mindfully — slow down and avoid distractions so your body can activate its “rest and digest” response
• Chew your food well to support the digestive process
• Manage stress through movement, time outdoors or relaxation techniques
• Stay active — even light exercise supports healthy digestion
• Prioritise sleep, giving your body time to restore and process

Listening to your body

One of the most important things you can do is pay attention to how your body responds.

If certain foods leave you feeling off — physically or mentally — it may be worth tracking what you eat and how you feel. Food intolerances or sensitivities can sometimes play a role in both digestive discomfort and mood changes.

And if you’re dealing with persistent gut or mental health issues, it’s important to seek guidance from a health professional.

The bottom line

Your gut and brain are in constant communication — and what affects one will almost always affect the other.

The good news is that this gives you more ways to support your health.

By combining balanced nutrition, fibre-rich foods, mindful eating and stress management, you’re not just looking after your digestion — you’re supporting your mood, your energy and your overall wellbeing.

Sometimes, it really does pay to trust your gut.