BIRNA

BIRNA Learning · Coming later

Understanding intestinal permeability, the microbiome and the gut–brain axis

An evidence-based course in the biology of the intestinal interface

10 modules53 lessons12–15 hours target workloadSelf-paced

Explore the programme and its scientific foundations.

Scientific positioning

A selective interface, not an impermeable wall

A structured introduction to the intestinal barrier as a selective, regulated interface, and to the evidence connecting permeability, microbial ecology and gut–brain communication.

Claims must be traceable to the shared BIRNA reference library or verified Publication records. Human, animal, observational and mechanistic evidence must remain distinguishable; uncertainty and limits of inference must be stated.

Curriculum

Ten connected modules

  1. 01

    The boundary between us and the world

    6 lessons

  2. 02

    Permeability is a physiological function

    5 lessons

  3. 03

    Zonulin and barrier regulation

    5 lessons

  4. 04

    The microbial ecosystem

    5 lessons

  5. 05

    Food, microbes and metabolites

    5 lessons

  6. 06

    From gut to brain

    5 lessons

  7. 07

    Barrier dysfunction and human health

    5 lessons

  8. 08

    Reading the science critically

    6 lessons

  9. 09

    The Permeability Paradox™

    5 lessons

  10. 10

    Integration

    6 lessons

Learning outcomes

Read the biology and the evidence together

  1. Explain why selective permeability is a normal physiological function.
  2. Describe the principal cellular, physical, immune and microbial components of intestinal barrier function.
  3. Distinguish transcellular and paracellular routes across the epithelium.
  4. Interpret evidence about zonulin, the microbiome and the microbiota–gut–brain axis without converting association into causation.
  5. Assess common study designs, measurement limits and translational boundaries in barrier research.
  6. Apply the Permeability Paradox as a framework for integrating exchange and protection.

For whom

A rigorous foundation

  • Health and nutrition professionals seeking a research-grounded conceptual foundation
  • Researchers, educators and advanced students working across adjacent disciplines
  • Educated non-specialists who want to read intestinal-barrier evidence critically