Gluten sensitivity is not always what it seems

For years, gluten – a protein present in wheat, barley and rye – was identified as the great villain of digestive discomfort. Millions of people around the world adopted gluten-free diets in search of relief.
However, a new international review published in The Lancet by researchers at the University of Melbourne reveals that most cases of “intolerance” are not caused directly by gluten, but by more complex mechanisms that involve the nervous and digestive systems.

The role of the intestine and the brain

The study suggests that the so-called non-celiac gluten sensitivity (NCGS) – a condition characterized by bloating, abdominal pain, fatigue or general discomfort after eating wheat – could be part of the gut-brain interaction disorders, similar to irritable bowel syndrome.
According to the researchers, the intestine and the central nervous system maintain a bidirectional communication that influences pain perception, intestinal transit and the immune response. Any alteration in this dialogue can generate symptoms, even without a direct reaction to gluten.

What science found

The experts analyzed dozens of clinical trials and systematic reviews.
His conclusions were clear:

• Only between 16% and 30% of those who claim to have gluten sensitivity develop symptoms when given this protein under controlled conditions.

• In many cases, discomfort also appears when faced with gluten-free foods, which points to other culprits, such as fermentable carbohydrates (FODMAPs) or the nocebo effect—the negative response generated by the expectation that something will cause harm.

• There are no specific biomarkers to diagnose NCGS, which makes it a diagnosis of exclusion, depending on the clinical context and the patient’s history.

Professor Jason Tye-Din, a gastroenterologist at the Royal Melbourne Hospital, explained:

“Distinguishing gluten sensitivity from other intestinal conditions is essential to offering individualized care and addressing underlying causes. Many patients improve not by eliminating gluten, but by adjusting their diet and reducing stress.”

Beyond gluten-free fashion

The popularity of gluten-free diets grew in the heat of marketing and misinformation. According to the authors, the food industry has contributed to reinforcing the idea that gluten is intrinsically harmful, when scientific evidence shows that only a minority of the population presents a real adverse response.
Eliminating it without medical indication can reduce the intake of fiber, vitamins and minerals, and unbalance the intestinal microbiota, aggravating precisely the problems that were intended to be avoided.

Dr. Jessica Biesiekierski, leader of the review, maintained that gastrointestinal symptoms must be addressed with an integrative vision, which considers diet, mental health and lifestyle habits.
“In most patients, digestive discomfort is due to multiple factors, and trying to resolve it with a single solution—such as eliminating gluten—is rarely effective,” he warned.

The future of diagnosis and personalized nutrition

The study proposes that public health messages stop presenting gluten as a universal enemy and focus on evidence-based food education.
The researchers recommend:

• Improve diagnostic guidelines and avoid hasty labels.

• Combine medical evaluation with psychological and nutritional support strategies.

• Promote balanced and supervised diets, without unnecessary restrictions.

The goal is not to deny the symptoms, but to understand their true causes, which may lie both in intestinal physiology and in the way the brain perceives signals from the body.

A paradigm shift

The Australian review redefines the concept of “gluten intolerance”. Far from being a simple reaction to a protein, most cases respond to a multifactorial imbalance between the intestine, microbiota, diet and nervous system.
The key, the authors conclude, is to listen to the body with science and not with fads.

Source: Infobae.