For decades, the brain was thought to operate in isolation.
But emerging research shows the gut acts like a “second brain,” influencing everything
from mood and memory to our risk of neurological disease.
This connection, called the gut-brain axis, is a two-way system where signals from the gut can directly impact behavior and mental state.
More precisely, it’s the microbiome–gut–brain axis at work. The trillions of microbes in our gut don’t just aid digestion; they shape our physiology, mood and even aspects of brain development.
At the centre is the ‘Enteric Nervous System’, often called our “second brain.”
It controls digestion and communicates with the central nervous system via the vagus nerve — a major highway linking gut and brain.
While much of the evidence comes from animal studies, human research is steadily revealing profound links between gut health and
mental wellbeing.
Your gut microbiome shifts throughout life, shaped by diet, environment, sleep, and stress. Unfortunately, processed foods and artificial sweeteners can negatively impact this balance.
The good news? Everyday food choices
can help:
– Eat a rainbow of plants: Colourful fruits and vegetables provide polyphenols that fuel beneficial microbes.
– Boost prebiotic fibre: From whole grains, legumes, nuts, and vegetables.
– Add fermented foods: Kefir, kimchi, and kombucha support gut health.
– Season generously: Herbs and spices add diversity and microbiome-supporting compounds.
Start young, I encourage families to expose children to a wide variety of foods, herbs and spices.
A diverse diet early in life helps build a resilient microbiome, supporting both gut and brain development.
As a functional nutritionist focused on women’s health, longevity, and healthy ageing, I use advanced gut microbiome testing to help clients understand how their gut influences their overall wellbeing.
It can be life-changing — not just for digestion, but for energy, mood and vitality.
For more information, contact me at hello@annabarrynutrition.com.
By Anna Barry, Functional Nutritionist (MHumNutr) NSA
