Gluten's Negative Effects: Understanding Celiac Disease & Sensitivity

Gluten-related disorders exist on a spectrum with distinct pathophysiology.

1. Celiac Disease (Autoimmune)

Genetic (HLA-DQ2/DQ8) + gluten exposure → anti-tTG IgA, villous atrophy. Symptoms: diarrhea, weight loss, anemia, osteoporosis, neuropathy, dermatitis herpetiformis. Treatment: Strict lifelong gluten-free diet.

2. Non-Celiac Gluten Sensitivity (NCGS)

Symptoms (bloating, pain, fatigue, brain fog) improve on GFD, but negative celiac serology/biopsy, no wheat allergy. Mechanism unclear (innate immunity, FODMAPs, ATIs). Diagnosis: Exclusion + response to GFD.

3. Wheat Allergy (IgE-Mediated)

Immediate hypersensitivity: urticaria, angioedema, anaphylaxis, GI/respiratory symptoms. Diagnosis: Skin prick, specific IgE, oral challenge. Avoid wheat; may tolerate other gluten grains.

4. Other Associations (Evidence Varies)

• Type 1 diabetes (shared HLA risk).
• Autoimmune thyroiditis (comorbidity).
• Neurologic: Gluten ataxia, peripheral neuropathy (celiac-related).
• Psychiatric: Depression/anxiety (may improve on GFD in celiac/NCGS).
• IBS overlap: Fructans (FODMAPs) in wheat often the trigger, not gluten.

Key Takeaway

Celiac = autoimmune, requires strict GFD. NCGS = symptom-based, excludes celiac/allergy. Wheat allergy = IgE-mediated. Self-diagnosis risks missing celiac; test before eliminating gluten.