Allergic diseases are traditionally framed as disorders of inappropriate immune reactivity to environmental antigens such as pollen, foods, or house dust mite. However, a growing body of evidence suggests that gastrointestinal barrier integrity and gut microbial ecology play a central role in shaping allergic susceptibility and symptom expression.
Given that approximately 70–80% of immune tissue resides within the gut‑associated lymphoid tissue (GALT), even subtle disturbances in intestinal permeability or microbiota composition may influence immune tolerance and inflammatory tone far beyond the gastrointestinal tract (Wiertsema, 2021).
In this blog, nutritional therapist Ruth explores the mechanistic links between intestinal permeability (“leaky gut”) and allergic disease, with particular reference to allergic rhinitis, but also within the broader context of atopy.
Last updated on 19th February 2026 by cytoffice
