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# Gluten

glu·ten - GLOO-ten

## Definition

Gluten is a group of storage proteins found naturally in wheat, barley, rye, and their derivatives. It gives dough its elastic, chewy texture and helps bread rise and maintain its shape. While gluten is harmless for most people, it triggers an immune-mediated inflammatory response in individuals with [celiac disease](/conditions/celiac-disease), and may cause symptoms in those with non-celiac gluten sensitivity.

In celiac disease - an autoimmune condition affecting approximately 1% of the population - gluten consumption causes the immune system to attack the lining of the small intestine, damaging the finger-like projections (villi) that absorb nutrients. Over time, this leads to malabsorption, nutritional deficiencies, and a range of symptoms from digestive distress to fatigue, joint pain, skin rashes, and neurological problems. The only treatment for celiac disease is strict, lifelong gluten avoidance.

Non-celiac gluten sensitivity (NCGS) is a more controversial condition in which individuals experience symptoms similar to celiac disease when eating gluten, but without the intestinal damage or autoimmune markers. The prevalence and mechanisms of NCGS are still being studied. Meanwhile, the gluten-free food market [has](/glossary/hyaluronic-acid) exploded into a multi-billion dollar industry, driven by both medical necessity and consumer trends - though there is no established health benefit to avoiding gluten for people without celiac disease or diagnosed sensitivity.

## Also Known As

Wheat protein 

## Key Facts

-   • Gluten is found in wheat, barley, rye, and triticale - oats are naturally gluten-free but often cross-contaminated. 
-   • Celiac disease affects roughly 1 in 100 people worldwide, but an estimated 80% of cases remain undiagnosed. 
-   • Diagnosis of celiac disease involves blood tests for specific antibodies (tTG-IgA) followed by intestinal biopsy. 
-   • The global gluten-free food market exceeded $8 billion in 2025. 
-   • There is no scientific evidence that a gluten-free diet provides health benefits for people without celiac disease or gluten sensitivity. 

## How It Relates To Your Health

If you experience chronic digestive symptoms, unexplained fatigue, iron-deficiency anemia, or skin rashes, your doctor may test for [celiac disease](/conditions/celiac-disease) through blood [antibody](/glossary/antibody) tests. It is important to continue eating gluten before testing, as eliminating it beforehand can produce false-negative results.

For those with confirmed celiac disease, strict gluten avoidance is essential and typically leads to complete intestinal healing within 6-18 months. Working with a registered dietitian experienced in celiac disease is recommended to ensure nutritional adequacy while navigating hidden sources of gluten in processed foods, medications, and personal care products.

## Related Terms

[Autoimmune Response](/glossary/autoimmune-response)[Allergen](/glossary/allergen)[Dysbiosis](/glossary/dysbiosis)[Leaky Gut](/glossary/leaky-gut)

## Related Articles

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[](/mental-health/gut-health-affects-mood)[Mental Health](/mental-health)

### How Gut Health Affects Your Mood

2025-11-10

## Sources

1.  [Celiac Disease](https://www.niddk.nih.gov/health-information/digestive-diseases/celiac-disease) - National Institute of Diabetes and Digestive and Kidney Diseases (NIH)
2.  [Gluten and Celiac Disease](https://www.mayoclinic.org/diseases-conditions/celiac-disease/symptoms-causes/syc-20352220) - Mayo Clinic
3.  [Non-Celiac Gluten Sensitivity](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6630947/) - National Library of Medicine

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In This Entry

[Definition](#definition)[Also Known As](#also-known-as)[Key Facts](#key-facts)[How It Relates To Your Health](#health-relevance)[Related Terms](#related-terms)[Related Articles](#related-articles)[Sources](#sources)

Browse Digestive Terms

[Irritable Bowel Syndrome](/glossary/irritable-bowel-syndrome)[Gastroesophageal Reflux Disease](/glossary/gastroesophageal-reflux-disease)[Microbiome](/glossary/microbiome)[Peristalsis](/glossary/peristalsis)[Leaky Gut Syndrome](/glossary/leaky-gut-syndrome)[Detoxification](/glossary/detoxification)

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