Is Gluten Sensitivity Real? What the Latest Research Actually Found

If you cut out bread and felt better, a review published in The Lancet on 22 October 2025 has something awkward to say. The gluten probably was not the problem.

That is a strong claim, so here is the careful version. A team led by Associate Professor Jessica Biesiekierski at the University of Melbourne went back through the published trials on non-celiac gluten sensitivity, the condition where someone feels unwell after eating wheat but tests negative for celiac disease. They paid particular attention to the trials where nobody knew who was eating gluten, not the participant and not the researcher running the study. In those trials, reactions to gluten were largely indistinguishable from reactions to a placebo.

“Contrary to popular belief, most people with NCGS aren’t reacting to gluten,” Biesiekierski said. “Our findings show that symptoms are more often triggered by fermentable carbohydrates, commonly known as FODMAPs, by other wheat components or by people’s expectations and prior experiences with food.”

Around one in ten people worldwide say they react to gluten. That is a lot of people to be pointing at the wrong ingredient.

What this does not change

MindShift Mentors · 7 nights freeDialled in the food. Now the 11pm head noise.Show me how it works

Before anything else, two conditions are untouched by this research.

Celiac disease is an autoimmune illness and it is not in dispute. In celiac disease, gluten triggers the immune system to damage the lining of the small intestine. The damage is measurable on a biopsy. It causes real harm over time, including malabsorption, anemia and bone loss. Nothing in this review suggests anyone with diagnosed celiac disease should eat gluten. The gluten-free diet remains the only treatment.

Wheat allergy is also a genuine immune reaction and is diagnosed differently again.

The review is about the third group, the much larger one, made up of people who feel worse after wheat, do not have celiac disease, and have been told or have decided that gluten is the culprit.

What the blinded trials showed

The reason blinding matters so much here is that stomach symptoms are unusually suggestible. Bloating, cramping and fatigue are all real sensations, but they are also sensations the brain helps generate. If you know you have just eaten the thing you believe makes you ill, that knowledge is part of the experiment whether the researchers like it or not.

So the good trials hide it. Participants get gluten or a convincing placebo in a form they cannot tell apart, and they report symptoms either way. When the University of Melbourne team pooled those trials, only a small number of participants showed a response that tracked the gluten specifically. For most people, the placebo produced the same complaints as the real thing.

That is the finding. It is not that people are imagining their symptoms. It is that gluten is not what is causing them.

The three suspects that came out of it

Fermentable carbohydrates

Wheat carries fructans, a type of FODMAP. FODMAPs are short-chain carbohydrates that the small intestine does not absorb well. They travel on to the large intestine, where gut bacteria ferment them, which produces gas and draws in water. In someone with a sensitive gut, that is bloating and pain.

Fructans and gluten live in the same foods. Cut out bread and pasta and you cut out both at once, so you never find out which one you were reacting to. Every gluten-free diet is also, accidentally, a partial low-FODMAP diet.

Onions, garlic, apples and legumes carry FODMAPs too, and none of them contain a scrap of gluten. If you went gluten-free and only got partway better, this is the usual reason.

Other parts of wheat

Gluten is one protein group in a grain that contains many. The review names other wheat components as a likely contributor, and this part of the science is less settled than the FODMAP part. It is enough to say that “wheat makes me feel bad” and “gluten makes me feel bad” are not the same sentence, and people have been treating them as if they were.

Expectation

This is the finding people bristle at, and it deserves to be explained properly rather than waved around.

The nocebo effect is the placebo effect running the other direction. If you expect a food to hurt you, your brain processes signals coming from your gut differently. Brain imaging supports this: expectation and emotion activate the same regions involved in pain and in judging threat. The review found that people with irritable bowel syndrome who believe they are gluten-sensitive respond much the same to gluten, to wheat and to placebo.

Your symptoms are not fake. The pain is happening. But the trigger you have identified may not be the one firing, and years of anxiety around eating make the whole system more reactive, not less.

Why any of this is worth acting on

There is an obvious objection here. If avoiding gluten makes you feel better, who cares why?

A few reasons.

Gluten-free products cost substantially more than their standard equivalents, and the gap has not closed. Many are also lower in fiber and fortified nutrients than the breads and cereals they replace, because rice and corn starch do not bring what wheat brings. A diet built around them without planning tends to run short on fiber, B vitamins and iron.

Then there is the social cost, which gets dismissed but should not be. Restricting your diet more tightly than you need to makes eating with other people harder every single time. If fructans are your problem, you may be able to eat slow-fermented sourdough, where much of the fructan content is broken down before baking, while you have been avoiding all bread for years.

And most importantly, if you self-diagnosed and went gluten-free without testing, you may have made an actual celiac diagnosis much harder to get.

The order matters, and most people get it backwards

Here is the single most useful thing in this article.

Get tested for celiac disease before you cut out gluten, not after.

Celiac blood tests look for antibodies your immune system produces in response to gluten. Remove the gluten and the antibodies fade, so the test can come back negative whether or not you have the disease. The Celiac Disease Foundation puts it plainly: you must be on a gluten-containing diet for antibody testing to be accurate.

If you have already gone gluten-free and want a real answer, current guidelines call for a gluten challenge of at least 3 to 6 grams of gluten a day for 12 weeks before testing. That is roughly two slices of wheat bread daily for three months, while feeling unwell. It should only be done under a doctor who knows celiac disease, and it should not be done during pregnancy. Compare that to a blood test taken before you change anything.

This is why “just try cutting it out and see” is poor advice, however well meant. It is a three-month penalty for a fifteen-minute blood test.

What to do with all this

If wheat makes you feel bad and you have not been tested, see your doctor while you are still eating it. That is step one and there is no shortcut around it.

If celiac disease is ruled out, the researchers behind the review are not suggesting you grin and bear it. Their recommendation is dietary change guided properly, with attention to nutrition and, where it helps, support for the gut-brain side of the problem. In practice that usually means working with a dietitian through a structured low-FODMAP trial and then a careful reintroduction, rather than cutting whole food groups out permanently and hoping.

The goal of that process is to end up eating more foods, not fewer. A well-run FODMAP trial is a diagnostic tool with an expiry date, not a life sentence.

If you are already gluten-free, feel genuinely well, and have had celiac disease properly ruled out, none of this obliges you to change anything. Plenty of people eat this way and are happy. But it is worth knowing that the door may be open wider than you think, and that sourdough, or oats, or the occasional real pasta might be back on the table if you tested it properly.

The researchers made one more point that lands beyond any individual diet. They argued for public messaging that moves away from the idea that gluten is inherently harmful. For the roughly 1 per cent of people with celiac disease, it genuinely is. For everyone else, a decade of blanket warnings has produced a lot of restricted eating, a lot of expense, and not much clarity about what is actually going on.

Worth reading next: our earlier look at whether gluten is bad for you, which covers the basics of how gluten behaves in the body.

This article describes published research and is not medical advice. Talk to your doctor before changing your diet, particularly if you have ongoing digestive symptoms.

Sources: Biesiekierski J et al., “Non-coeliac gluten sensitivity”, The Lancet, 22 October 2025; University of Melbourne newsroom, October 2025; Celiac Disease Foundation, screening and diagnosis guidance.