The gut-brain connection: Boost your brain power with a healthy gut microbiome

“The gut and brain communicate through the gut-brain axis. This bi-directional system links the central nervous system (CNS) with the enteric nervous system (ENS), often referred to as the second brain. The ENS produces neurotransmitters, chemical messengers that regulate emotions, cognition, and stress responses” explains Dr Sharma, adding, “Nearly 90% of the body's serotonin, the neurotransmitter responsible for happiness and emotional stability, is produced in the gut. This means that an imbalanced gut can contribute to anxiety, depression, and even cognitive decline."

Another key player, says Dr Sharma, is the vagus nerve, which acts as a direct link between the gut and brain. When the gut is healthy, this pathway functions optimally, supporting emotional balance and mental clarity. “However, gut disturbances, such as inflammation or dysbiosis (an imbalance in gut bacteria), can disrupt these signals, affecting mood, stress levels, and even decision-making,” he says.

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Role of gut microbiome:

At the heart of the gut-brain connection lies the gut microbiome, a vast ecosystem of trillions of bacteria, fungi, and other microorganisms residing in the digestive tract. This microbiome not only aids digestion but also plays a vital role in brain function and emotional well-being.

"The gut microbiome is an essential player in brain health. A diverse and balanced microbiome supports cognitive function, while an unhealthy gut can lead to chronic inflammation, mood disorders, and even neurodegenerative conditions," says Dr Sharma.

He explains how the gut microbiome influences brain function in several ways:

Neurotransmitter production: Beneficial gut bacteria help synthesise neurotransmitters like serotonin, dopamine, and gamma-aminobutyric acid (GABA), which regulate mood, focus, and emotional resilience.

Inflammation control: A healthy gut reduces systemic inflammation, while an imbalanced microbiome can contribute to chronic inflammation, a key factor in anxiety, depression, and cognitive impairment.

Metabolite production: Gut bacteria produce short-chain fatty acids (SCFAs), which can cross the blood-brain barrier and influence brain function, memory, and learning.

Stress response regulation: The gut plays a key role in regulating cortisol levels, the body’s primary stress hormone. When the gut microbiome is balanced, it helps maintain a healthy stress response.

Supporting a healthy gut for a healthy mind:

Given its influence on mental health, maintaining a healthy gut should be a priority. “Your diet is one of the most powerful tools for maintaining a healthy gut-brain balance. A diet rich in fibre, fermented foods, and prebiotics supports microbial balance. Probiotics, found in foods like yogurt, kimchi, and sauerkraut, introduce beneficial bacteria that enhance both gut and brain function,” informs Dr Sharma.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for specific health diagnosis.