Gut-Brain Axis

TL;DR: The gut-brain axis is real: a 2025 Nature Mental Health study of 243 people found the stomach's natural rhythm is closely linked with brain activity, and that this coupling tracks mental wellbeing. It adds weight to the idea that gut health and mental health are connected, so a fibre-rich daily routine is a smart move. Propel Health's Organic Inulin is an easy prebiotic fibre to add.

New Research Links Gut & Brain Axis

Your Gut and Mental Health: More Connected Than You Think

We’ve all felt it: “butterflies in the stomach” when nervous, or that “sick to your stomach” feeling under stress. Now, science shows there’s truth to these sayings.

A groundbreaking study published in Nature Mental Health by researchers from Aarhus University, Denmark, reveals that the stomach and brain are closely linked — and that this connection may directly reflect mental health.

The Study at a Glance

• 243 participants were studied using advanced imaging techniques.
• Researchers measured both stomach rhythms (electrogastrography) and brain activity (fMRI).
• Mental health profiles ranged from high well-being to symptoms of anxiety, depression, fatigue, and insomnia.

The key finding?

Stronger synchronisation between the stomach’s rhythm and the brain’s activity was linked with poorer mental health.

What Scientists Found

• People reporting higher anxiety, depression, stress, and fatigue showed stronger coupling between stomach and brain activity.
• Those with better well-being, best time to take inulin, and life satisfaction had weaker stomach-brain coupling.
• This link wasn’t random, it was strongest in brain regions involved in attention, emotion, and cognitive control.
• The effect was specific to the stomach-brain axis, not explained by heart rate, breathing, or general brain activity.

Why This Matters

This research suggests that your stomach’s natural rhythm isn’t just about digestion. It may act as a signal of emotional and psychological states:

• Stronger coupling = potential “alarm system” reflecting stress, anxiety, or low mood.
• Weaker coupling = more balance, well-being, and resilience.

While past research has focused on the gut microbiome and digestion’s role in mental health, this study highlights a new dimension: the stomach’s electrical rhythms and how they directly communicate with the brain.

The Gut-Brain Axis in Everyday Life

This study adds weight to the idea that gut health, mental health and even behaviour are inseparable. 

It’s why nutrition, prebiotics, probiotics, and lifestyle strategies that support the gut may also influence:

• Mood and stress resilience
• Sleep quality
• Energy and focus
• Overall mental well-being

What’s Next in Research?

The Aarhus team plans to:

• Explore this connection in people formally diagnosed with anxiety or depression.
• Conduct long-term studies to see if stomach-brain coupling predicts future mental health changes.
• Test whether interventions that alter gut-brain communication can improve mood and well-being.

Key Takeaway

This research shows that your gut feelings are real, the stomach’s rhythm can reflect your mental state.

By caring for gut health, we may find new ways to support mental well-being.

We believe that nutrition and lifestyle play a central role in the gut-brain connection.

Supporting your digestion today may help strengthen both body and mind for tomorrow.

Where to Buy Inulin Fibre?

Click here to buy Inulin Fibre.

We offer this post for education purposes only. Please consult your Health Practitioner for personalised and specific information.

References

1. Banellis L et al. Stomach-brain coupling indexes a dimensional signature of mental health. Nature Mental Health. 2025. doi:10.1038/s44220-025-00468-6