Glossary
Intestinal permeability
When the gut lining becomes leakier than it should, letting particles cross into the blood.
The gut lining is meant to be selective — letting nutrients through while keeping most else out. With increased intestinal permeability (popularly called 'leaky gut'), the junctions between cells loosen, so partially digested food proteins and bacterial fragments can slip into the bloodstream and keep the immune system on alert. It's a plausible mechanism behind why food can influence autoimmune and inflammatory symptoms.
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