Gluten Allergies and the Incidence of Gastrointestinal Health Conditions: A Systematic Review
Main Article Content
Abstract
Background: Gluten-related disorders encompass a spectrum of conditions triggered by adverse reactions to gluten, including celiac disease (CD), non-celiac gluten sensitivity (NCGS), and wheat allergy. These disorders vary in genetic predisposition, immunopathology, and clinical manifestations, often affecting both gastrointestinal (GI) and extraintestinal systems.
Objectives: This systematic review aimed to synthesize current evidence on the relationship between gluten-related disorders and GI health, focusing on prevalence, symptom patterns, microbiome alterations, immune responses, and dietary intervention outcomes.
Methods: A systematic literature search was conducted in PubMed, Scopus, Web of Science, Embase, and Google Scholar from inception to December 2024. Inclusion criteria were peer-reviewed studies reporting GI or extraintestinal outcomes in individuals with CD, NCGS, or self-reported gluten sensitivity. Ten studies were included, comprising randomized controlled trials, cross-sectional surveys, and microbiome analyses. Data extraction and quality assessment were performed independently, and narrative synthesis was conducted.
Results: Gluten exposure induces significant GI symptoms in CD and confirmed NCGS populations. Gluten-free diet interventions improved symptom severity, quality of life, and energy levels. Microbiome studies demonstrated dysbiosis characterized by altered Gram-negative to Gram-positive bacterial ratios and immune dysregulation in CD. Nocebo and expectancy effects were prominent in NCGS trials, while gluten exposure alone did not consistently trigger symptoms in non-celiac IBS populations. Extraintestinal manifestations included fatigue, headache, cognitive changes, oral lesions, and systemic inflammation.
Conclusions: Gluten-related disorders present a continuum of GI and systemic effects, influenced by genetic predisposition, immune activation, microbiota composition, and psychosocial factors. Accurate diagnosis, personalized dietary management, and consideration of microbiome and immune mechanisms are essential to improve patient outcomes.