For decades, the gut and brain were considered independent. Recent research has overturned this entirely. The gut-brain axis — a bidirectional communication network — is now one of the most active areas in neuroscience.

Your Second Brain

The gut contains approximately 100 million neurons — more than the spinal cord. It produces 90 percent of the body’s serotonin. When gut microbiome is disrupted, these neurotransmitter systems are directly affected.

Short-chain fatty acids produced by beneficial gut bacteria when fermenting dietary fibre influence brain function, inflammation levels, and immune responses. Diverse microbiome composition appears protective against both mental and physical conditions.

Feeding the Gut-Brain Connection

Dietary diversity is the most evidence-backed way to support a healthy microbiome. Consuming 30 or more different plant foods per week supports microbial diversity. Fermented foods directly introduce beneficial bacteria.

Ultra-processed foods reduce microbial diversity and increase intestinal permeability, allowing inflammatory compounds to enter the bloodstream and affect brain function. The relationship between diet, gut health, and mood is now robust.