The past couple of weeks, we talked about celiac disease, which is an autoimmune disease that causes the immune system to attack the lining of the small intestine. But not all gluten sensitivity is caused by celiac disease. Today, we will talk about a different type of gluten sensitivity, which is estimated to affect 1-3% of the US population.
What is Non-Celiac Gluten Sensitivity?
Non-celiac gluten sensitivity (NCGS) describes a condition in which people experience symptoms after eating foods containing wheat, barley, or rye, but do not have celiac disease or a wheat allergy. Symptoms often improve when gluten is removed from the diet and return when gluten is reintroduced. Unlike celiac disease, NCGS does not cause the same autoimmune intestinal damage, and all tests for celiac disease are negative.What Symptoms Can NCGS Cause?
People with NCGS may experience a wide range of symptoms, many of which overlap with celiac disease or irritable bowel syndrome. Common symptoms include:
- Bloating, abdominal pain, gas, or diarrhea
- Constipation
- “Brain fog” or difficulty concentrating
- Fatigue or chronic tiredness
- Headaches or migraines
- Joint or bone pain
- Mood changes, including anxiety or depression
These symptoms typically improve when wheat, barley, and rye are removed from the diet.
Is Gluten Really the Culprit in NCGS?
This is where things get interesting, and a bit more complicated. Research suggests that gluten may not be the only trigger in NCGS. Other components of wheat, such as amylase trypsin inhibitors (ATIs) and fructans (a type of FODMAP carbohydrate), may provoke symptoms in some people diagnosed with NCGS. These substances can cause digestive discomfort even without an immune reaction. Because of this, some experts prefer the term non-celiac wheat sensitivity (NCWS).
Controlled studies show that only a minority of people who believe they are gluten sensitive have symptoms triggered by gluten alone. This suggests that other wheat components, or even the nocebo effect (expecting to feel worse), may play a role.
How is NCGS Diagnosed?
There is no single test for NCGS. Diagnosis is made by:
- Ruling out celiac disease (blood tests and/or a biopsy)
- Ruling out wheat allergy
- Observing symptom improvement on a gluten-free diet
- Noting symptom recurrence when gluten is reintroduced
Because symptoms overlap with many other conditions, it’s important not to self-diagnose. A supervised elimination and re-challenge process is often recommended.
How is NCGS Treated?
The primary treatment is a gluten-free diet, though the degree of restriction may vary. Unlike celiac disease, where a strict gluten-free diet is essential, in NCGS/NCWS some people find they can tolerate small amounts of gluten or wheat, while others feel best with strict avoidance. Working with a clinician or dietitian can help ensure nutritional balance and avoid unnecessary dietary restrictions.
What’s the Bottom Line for Patients?
NCGS or NCWS is real, but still not fully understood. Symptoms can be significant and life impacting, yet the underlying triggers may vary from person to person. A thoughtful, medically guided approach helps patients avoid both over restriction and missed diagnoses.
If you have any questions about Celiac Disease or gluten sensitivity, please log into your account and send us your question. We are here to help.
Dr. Anita Bennett MD – Health Tip Content Editor