Episode 116: The Adrenal-Gut-Immune Triangle: Why Your Gut Protocol Isn’t Working
If you’ve changed your diet, taken the probiotics, followed the gut protocol, and you’re still not fully well, this episode explains why. In part two of our gut-immunity series, we introduce the adrenal-gut-immune Triangle and the missing link that keeps so many people stuck: chronic stress and HPA axis dysfunction. You’ll learn how cortisol dysregulation increases gut permeability (“leaky gut”), suppresses secretory IgA, disrupts the microbiome, and drives chronic inflammation… even when you’re doing everything “right” for your gut.
We break down the difference between HPA hyperactivation (“wired but tired”) and adrenal hypoactivation (often called adrenal fatigue), why standard blood tests miss these patterns, and how chronic stress silently undermines immune health. Most importantly, you’ll understand how to stabilise blood sugar, restore your cortisol rhythm, reduce inflammation, and support gut repair in a way that actually holds.
This episode answers questions like:
“What is HPA axis dysfunction?”
“Symptoms of adrenal fatigue”
“What causes leaky gut?”
“Cortisol and gut permeability”
“Can stress cause autoimmune disease?”
“Cortisol resistance and inflammation”
“How to repair gut lining naturally”
If you’ve ever said, “I’ve tried everything,” this episode will help you see what’s been missing and what to do next. This episode also includes an invitation to the Goode Health Studio.
DISCLAIMER: The content in this podcast and related website is not intended to be a substitute for medical advice. It is not intended to be used to diagnose or treat, instead it is designed to help educate and inspire. Always seek the advice of a professional medical practitioner or qualified health practitioner. Never ignore or disregard advice given to you based on information in this podcast or related website and do not delay in seeking medical advice.
Timestamps:
[02:12] - What the Adrenal System Actually Is (HPA Axis Explained)
Understanding the hypothalamic-pituitary-adrenal (HPA) axis, cortisol production, and how your stress response system regulates blood sugar, inflammation, sleep, and immune modulation.
[04:25] - HPA Axis Dysfunction: Hyperactivation vs Adrenal Fatigue
The difference between wired-but-tired cortisol elevation and later-stage adrenal hypoactivation, and why standard blood tests often miss both patterns.
[06:28] - How Chronic Stress Damages the Gut
How elevated cortisol increases gut permeability (leaky gut), suppresses secretory IgA, and disrupts the gut microbiome.
[08:14] - What Chronic Cortisol Does to the Immune System
How prolonged stress leads to immune dysregulation, chronic inflammation, cytokine imbalance, and increased autoimmune risk.
[10:50] - The Self-Reinforcing Stress–Gut–Inflammation Loop
How HPA axis dysfunction drives gut damage, gut damage drives systemic inflammation, and inflammation reactivates cortisol, creating a cycle that keeps you stuck.
[11:40] - Identifying Your Dominant Pattern: Adrenal, Gut or Immune?
How to recognise whether stress physiology, digestive dysfunction, or immune activation is your primary driver.
[14:38] - What Working With the Triangle Actually Looks Like (3 Core Priorities)
Why sequencing matters and how to approach the adrenal-gut-immune system as one integrated protocol.
[20:40] - Why Addressing All Three Systems Creates Durable Results
How treating the adrenal-gut-immune triangle together allows gut repair and immune balance to finally hold.
“Most people think they’re dealing with separate problems: gut issues, low immunity, burnout, inflammation. But clinically, what I see is that these are often not separate issues at all. They’re different expressions of the same system. Chronic stress dysregulates the HPA axis. That dysregulation damages the gut barrier and disrupts the microbiome. A compromised gut then drives systemic inflammation. And that inflammation feeds back into the stress response, activating the HPA axis again. The triangle starts feeding itself. And that’s why addressing only the gut, or only the immune system, so often gives partial results.”
Essential learnings from this episode…
Even the best gut protocol can fail if cortisol remains dysregulated. Chronic stress increases gut permeability (leaky gut) and disrupts the microbiome, preventing lasting repair.
Standard blood tests rarely detect cortisol rhythm disruption. HPA axis dysfunction can present as “wired but tired” or adrenal hypoactivation, both of which impact immune and digestive health.
Cortisol directly impacts immune regulation. While acute cortisol reduces inflammation, chronic stress leads to immune resistance, increased pro-inflammatory cytokines, and higher autoimmune risk.
The gut-immune-stress loop is self-reinforcing. HPA axis dysfunction damages the gut. Gut damage drives inflammation. Inflammation activates cortisol. Without breaking this cycle, symptoms persist.
Frequent glucose dips trigger cortisol spikes. Stabilising blood sugar with protein-rich meals reduces stress hormone activation and supports gut healing.
Lasting improvement happens when adrenal regulation, gut repair, and immune modulation are addressed simultaneously, not in isolation.
EPISODE 116
Important links & mentions from this episode
The Optimal You 7 Day Reset (£7.99)
Goode Health Clinic Functional Medicine Packages
Episode 115: Why Your Gut Is Running Your Immune System (And What to Do When It’s Not Working)
Take the FREE MitoImmune Health Assessment
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