Foundations › Gut and Immunity
Gut and Immunity: Foundations
The largest concentration of immune tissue in the body sits one cell layer from everything you have ever swallowed. Six readings, a check on each, free.
Reviewed by Team SOMA
Last updated August 2026 · English
What you'll be able to do
- âś“Why most of your immune system sits around the gut
- âś“Why fibre works even though you cannot digest it
- âś“Leaky gut: what is real and what is being sold
- âś“Food reactions: what the tests mean and what they do not
- âś“Gut and brain: five channels, and the serotonin claim
- âś“The gut barrier: what zonulin can and cannot show
What's inside
The gut barrier and immune traffic
Why most of your immune system sits around the gut
Knowledge check: The gut barrier and immune traffic
Fibre, fermentation and signalling
Intestinal permeability, honestly
Food reactions and how to sort them
The gut-brain channels
The gut barrier: what zonulin can and cannot show
Finish with the check
Is this for you?
Who it's for
- Anyone starting out in this field, with no science background assumed
- People who want to understand their own health rather than be told what to do
What you need
- Nothing to pay. A free SOMA account, so your progress and knowledge checks are saved.
- The journal articles behind each reading can be read without an account.
About this course
The largest concentration of immune tissue in the body sits a single cell layer away from everything you have ever swallowed. Most of what looks puzzling about immunity starts to make sense from there.
You will meet the border and why the immune system stations itself on it, what intestinal permeability actually is once the buzzwords come off and which tests for it hold up, why fibre behaves more like a signalling molecule than like roughage, how to sort a genuine food reaction from the rest, and the traffic between gut and brain that runs mostly upward.
Six readings, each with a short check. Free, and yours to take in any order.
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