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Gluten Intolerance – Causes, Symptoms and Treatment

Gluten intolerance refers to an adverse reaction to gluten, a protein found in wheat, barley, and rye. It includes conditions such as celiac disease, wheat allergy, and non-celiac gluten sensitivity.

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Things worth knowing about "Gluten Intolerance"

Gluten intolerance refers to an adverse reaction to gluten, a protein found in wheat, barley, and rye. It includes conditions such as celiac disease, wheat allergy, and non-celiac gluten sensitivity.

What Is Gluten Intolerance?

Gluten intolerance is an umbrella term for conditions in which the body reacts negatively to gluten – a protein found in wheat, barley, rye, and spelt. The three main forms are celiac disease (an autoimmune disorder), wheat allergy, and non-celiac gluten sensitivity (NCGS). Each form has distinct causes, mechanisms, and management strategies.

Causes and Forms

Celiac Disease

Celiac disease is a chronic autoimmune condition. When individuals with this condition consume gluten, their immune system attacks the lining of the small intestine, damaging the villi – small finger-like projections responsible for nutrient absorption. This damage leads to malabsorption and a range of nutritional deficiencies. A genetic predisposition, particularly the presence of the HLA-DQ2 and HLA-DQ8 genes, plays a critical role in disease development.

Wheat Allergy

Wheat allergy is a classic IgE-mediated allergic reaction to proteins in wheat – not exclusively to gluten. The immune system mistakenly identifies these proteins as harmful and triggers a release of histamine and other inflammatory mediators, causing allergic symptoms.

Non-Celiac Gluten Sensitivity (NCGS)

NCGS is less well understood. People with this condition test negative for celiac disease and wheat allergy, but still experience symptoms after consuming gluten-containing foods. The exact mechanism is still being studied. Research suggests that, in addition to gluten, other wheat components such as FODMAPs (fermentable carbohydrates) may contribute to symptoms.

Symptoms

Symptoms can vary depending on the form of gluten intolerance and may affect the digestive system as well as other parts of the body:

Digestive symptoms: Bloating, abdominal pain, diarrhea, or constipation
General symptoms: Fatigue, exhaustion, difficulty concentrating (often called brain fog)
Nutritional deficiencies (especially in celiac disease): Iron deficiency, vitamin B12 deficiency, calcium deficiency
Skin manifestations: Rash; in celiac disease, a specific blistering rash known as dermatitis herpetiformis
In children: Growth delays and failure to thrive

Diagnosis

Diagnosing gluten intolerance requires a thorough medical evaluation, as the different forms present differently:

Blood tests: In suspected celiac disease, specific antibodies are measured, particularly anti-tissue transglutaminase IgA (tTG-IgA) and endomysial antibodies (EMA).
Small intestinal biopsy: Considered the gold standard for celiac disease diagnosis. Tissue samples from the small intestine are examined for villous atrophy.
Genetic testing: Detection of HLA-DQ2/DQ8 genes cannot confirm celiac disease but can largely rule it out.
Allergy testing: Skin prick tests or specific IgE antibodies in the blood are used to exclude wheat allergy.
Exclusion diagnosis for NCGS: If celiac disease and wheat allergy are ruled out and a gluten-free diet relieves symptoms, NCGS is diagnosed.

Important: A gluten-containing diet should not be discontinued before testing, as this can interfere with test accuracy.

Treatment

The only effective treatment for all forms of gluten intolerance is a strict gluten-free diet. This means completely avoiding foods containing wheat, barley, rye, spelt, and related grains.

Gluten-Free Diet in Daily Life

Permitted grains: rice, corn, millet, quinoa, buckwheat, amaranth, oats (only certified gluten-free oats)
Watch for hidden gluten in processed foods, sauces, deli meats, and medications
Avoid cross-contamination in the kitchen (e.g., shared cutting boards or toasters)

Additional Measures for Celiac Disease

If nutritional deficiencies are present, targeted supplementation with vitamins and minerals (e.g., iron, vitamin D, folic acid, calcium) may be necessary until the intestinal lining has recovered. Regular follow-up appointments with a physician are recommended.

References

European Society for the Study of Coeliac Disease (ESsCD) – Guideline on Celiac Disease and Gluten-Related Disorders, 2019. Available at: https://www.escd.org
Catassi C. et al. – Non-Celiac Gluten Sensitivity: The New Frontier of Gluten Related Disorders. Nutrients, 2013. PubMed PMID: 24077239
Lebwohl B., Sanders D.S., Green P.H.R. – Coeliac disease. The Lancet, 2018. DOI: 10.1016/S0140-6736(17)31796-8

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