The Gut–Brain Axis Is No Longer a Theory. It’s a Measurable System
Five years ago, the gut–brain axis was considered a functional medicine concept.
Today, it’s one of the most studied communication systems in the human body, with new research showing the gut influences:
mood and emotional regulation
memory and focus
sleep patterns
stress resilience
hunger and cravings
inflammatory signaling
immune balance
The microbiome produces chemical messengers that travel through the bloodstream and the vagus nerve, directly shaping how you think and feel.
In 2025, researchers call the gut “the second brain” because it contains over 500 million neurons, more than the spinal cord.
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