Gluten and non-celiac sensitivity: symptoms, diagnosis and diet
What it found
Some people without celiac disease or wheat allergy get gut and other symptoms after eating gluten, and their symptoms improve when they stop.
The paper says there is no validated biomarker yet, so diagnosis is hard.
What they found
Studies in people
How common
Estimates suggest non-celiac gluten sensitivity affects about 0.5 to 6 percent of the general population. It is more common in women and in people in their teens to thirties.
Symptoms
Symptoms include bloating, abdominal pain, diarrhea, constipation, headache, tiredness, joint or muscle pain, and skin rash. They usually appear within hours of eating gluten and improve when gluten is removed from the diet.
Overlap with IBS
Symptoms overlap a lot with irritable bowel syndrome. In one Korean study, 43.6% of people with IBS linked gluten foods to their symptoms, compared with 15.2% of the general population.
Gluten-free diet
A gluten-free diet may help some people with gut symptoms, especially those like IBS symptoms. But it can lack vitamins and minerals, and long-term use needs careful monitoring.
Other findings
Diagnosis
There is no specific biomarker. Diagnosis relies on symptom scores before and after eating gluten or a placebo, and on ruling out celiac disease and wheat allergy. The Salerno criteria require a 6-week gluten-free diet, then double-blind gluten or placebo challenges one week apart, with a symptom difference of at least 30%.
FODMAPs confusion
Wheat contains FODMAPs, which can cause gas and bloating. So improvement on a gluten-free diet might be due to eating fewer FODMAPs rather than avoiding gluten itself.
What the authors conclude
“The absence of validated biomarkers remains a significant limitation for research studies on NCGS.”
Also in their conclusions
- They say non-celiac gluten sensitivity still lacks a biomarker, making diagnosis difficult, and understanding of its cause is poor.
- They note that gluten-related symptoms are expected to increase in Korea as wheat intake rises, but doctors' awareness of dietary treatment is still lacking.
- They call for standardized diagnostic methods and prospective studies for various treatments.
How it was done
The authors wanted to review what is known about non-celiac gluten sensitivity, a condition that has been increasingly recognised in Korea as wheat intake rises.
They reviewed existing studies and clinical information on how common non-celiac gluten sensitivity is, what causes it, how it is diagnosed, its symptoms, its overlap with irritable bowel syndrome, and how it is treated with a gluten-free diet.
What it can’t tell you
- This is a review of existing studies, not a new trial, so it cannot prove cause and effect.
- Many studies relied on self-reported symptoms, which can be unreliable.
- It cannot show whether non-celiac gluten sensitivity is a permanent condition or a temporary state.
Who paid
- Authors work at
- Gyeongsang National University Changwon Hospital, Korea
The paper
- Title
- [Non-celiac Gluten Sensitivity]
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people
- Summarised from
- Full text
- Cite
- Cha RR, Kim HJ (2020). [Non-celiac Gluten Sensitivity]. The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi. doi:10.4166/kjg.2020.75.1.11Free full textPubMed 31986568DOI
Summary written 26 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error