The Funk'tional Nutrition Podcast The Gut-Brain Axis: How Stress, Perception & the Subconscious Shape Digestive Health | Ep 403
Mar 24, 2026
Explores how stress, subconscious patterns, and nervous system signaling shape digestion. Covers bidirectional gut-brain pathways, vagal control of motility, and how chronic stress impairs digestive function. Discusses trauma, prediction loops, visceral hypersensitivity, and how neuroplasticity and mindset shifts can interrupt stuck symptom patterns.
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Gut Inflammation Drives Brain Inflammation
- Gut dysbiosis and intestinal permeability send pro-inflammatory signals like LPS to the brain and activate neuroinflammation.
- Reduced short-chain fatty acids and translocated endotoxins can cross to the brain, priming HPA axis activation and mood symptoms.
Vagus Tone Controls Real Digestive Function
- The vagus nerve and autonomic nervous system mediate bidirectional gut-brain signals that control digestion and motility.
- Low vagal tone from chronic sympathetic dominance disrupts gastric emptying, enzyme release, gallbladder contraction, and peristalsis causing bloating and constipation.
Perceived Safety Determines Digestive State
- The nervous system is the body's ongoing safety detector integrating exteroception, interoception, and proprioception.
- If the brain perceives danger, it blocks rest and digest and shifts biochemistry to protection, impairing digestion even if objectively safe.