GIP and celiac disease: These assays may be a practical method to assess dietary adherence in coeliac patients.19, 20, 21 GIP are resistant to gastrointestinal digestion and account for immunogenic reactions in T cells of patients with coeliac disease.22 Unlike traditional methods to monitor GFD adherence which only evaluate the consequences of GFD transgressions, this non‐invasive method enables a direct and quantitative assessment of gluten exposure.