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Posts tagged "gut-brain axis"

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80% Afferent: Why Your Body Does Far More Talking Than Your Brain
vagus nerve interoception autonomic nervous system

80% Afferent: Why Your Body Does Far More Talking Than Your Brain

We picture the vagus nerve as a command line from brain to body. But roughly 80% of its fibers run the other way, carrying the body's report upstream. That single ratio rewrites what anxiety, dread, and 'feeling off' actually are.

By UltraSkool Research Team Jul 22, 2026
The Hepatic Vagal Branch: The Liver's Direct Line to the Brain for Glucose and Energy
vagus nerve metabolic health gut-brain axis

The Hepatic Vagal Branch: The Liver's Direct Line to the Brain for Glucose and Energy

Long before glucose reaches your bloodstream, a small nerve branch off the vagus is already telling your brain what the liver sees. This hepatic line is one of the body's most underappreciated metabolic sensors — and when it goes quiet, energy regulation drifts.

By UltraSkool Research Team Jul 22, 2026
Serotonin Is Made in the Gut: Rethinking Mood at Its Source
serotonin gut health microbiome

Serotonin Is Made in the Gut: Rethinking Mood at Its Source

Roughly 90% of the serotonin in your body is produced in the intestinal wall, not the brain. That single fact reorganizes the way we should think about mood, digestion, and the treatments that actually work.

By UltraSkool Research Team May 14, 2026
The Gut-Brain Axis: Mitochondria at the Crossroads
gut-brain axis mitochondria vagus nerve

The Gut-Brain Axis: Mitochondria at the Crossroads

Your gut and brain are in constant conversation — and mitochondria are the interpreters. From serotonin production to vagal signaling, mitochondrial health determines the quality of this crucial dialogue.

By Ultra Skool Apr 8, 2026