A landmark study published in The Lancet suggests that most people who believe they have gluten intolerance may be mistaken. The research, led by the University of Melbourne, distinguishes between coeliac disease—an autoimmune condition triggered by gluten—and non-coeliac gluten sensitivity (NCGS), which affects up to 15% of the global population.
Dr Jessica Biesiekierski, an author of the study, explained that contrary to popular belief, NCGS symptoms such as bloating, gut pain, and fatigue are often not caused by gluten itself. Instead, the sensitivity appears to arise from the gut-brain interaction, with fermentable carbohydrates (Fodmaps), other wheat components, or psychological factors playing a key role.
Clinical trials reviewed in the study found that only a few cases showed a genuine reaction to gluten. Most participants responded similarly to gluten, wheat, and placebo, suggesting that anticipation and interpretation of gut sensations strongly influence symptoms. This indicates that NCGS may be part of the gut-brain interaction spectrum, akin to irritable bowel syndrome (IBS), rather than a distinct gluten-triggered disorder.
Dr Jason Tye-Din, a gastroenterologist at the Royal Melbourne Hospital not involved in the research, emphasised the importance of distinguishing NCGS from related conditions. He stated that accurate diagnosis and individualised care are essential to avoid unnecessary dietary restrictions and to treat underlying drivers of symptoms.
The findings could reshape how NCGS is defined, diagnosed, and treated, with implications for patients self-managing symptoms, clinicians prescribing restrictive diets, and policymakers shaping public health messaging.
