As a restorative health practitioner, one of the most common questions I hear is: “Do I really need to avoid gluten if I don’t have celiac disease?” The short answer? For many people, yes.
Let’s break down why gluten is such a problem for the gut and immune system and why eliminating it can be especially important if you’re dealing with chronic symptoms or autoimmune conditions like Hashimoto’s thyroiditis.
First, what is gluten, and where is it found?
Gluten is a protein naturally found in wheat, barley and rye. It gives bread its chewy texture and helps dough rise. But because of its versatility, gluten is also added to countless packaged foods, sauces, canned soups and salad dressings, and it’s even in non-food items like cosmetics and medications. Today, we’re exposed to gluten far more often than previous generations.
Celiac disease vs. gluten sensitivity
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- Celiac disease is an autoimmune condition in which gluten triggers the immune system to attack the small intestine, wearing down the villi (tiny finger-like projections that absorb nutrients). Over time, this can lead to nutrient deficiencies, digestive distress and systemic health problems.
- Non-celiac gluten sensitivity doesn’t destroy the villi in the same way, but it can still cause inflammation, disrupt the gut lining, and lead to symptoms like bloating, fatigue, brain fog, joint pain and mood changes.
Even if you “only” have a sensitivity, the end result is still gut damage, immune activation and downstream health challenges.
Other reasons gluten can be a problem
For some people, the issue isn’t gluten alone. The body may also react to:
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- Pesticides or chemicals sprayed on wheat
- FODMAPs (fermentable carbohydrates like fructan found in wheat, barley and rye that can cause digestive distress)
- Cross-reactive foods like dairy, yeast, oats, millet, rice or corn, which the immune system can confuse with gluten
This is why some people still experience symptoms even after cutting gluten — their bodies are reacting to other similar triggers.
Why gluten is so harmful for the gut and immune system
1. Gluten and leaky gut
Gluten increases production of a protein called zonulin, which regulates the tight junctions in the gut lining. Too much zonulin “opens the gates” of the intestinal wall, allowing particles of food, toxins and microbes to leak into the bloodstream. This causes a condition called intestinal permeability (or “leaky gut”). This leakage provokes the immune system, creating a pathway for multiple food sensitivities and systemic inflammation. Research shows this process happens in everyone to some degree, not just people with celiac disease, because gluten is inherently difficult for the human body to digest.
2. Antinutrients in gluten-containing grains
Grains that contain gluten also carry lectins, phytic acid, and enzyme inhibitors. These compounds can block nutrient absorption, irritate the gut lining and stimulate pro-inflammatory cytokines, adding another layer of stress to the digestive and immune systems.
3. Modern wheat isn’t what it used to be
Today’s wheat has been extensively hybridized to increase yield and baking qualities. The result is new gluten proteins that the human body doesn’t recognize. Instead of tolerating them, the immune system often treats them as a foreign invader, which triggers inflammation. Combine this with the fact that gluten is now hidden in countless food and household products, and our exposure has skyrocketed.
4. Molecular mimicry
On a molecular level, gluten proteins look very similar to other tissues in the body, such as the thyroid gland. This similarity can confuse the immune system, leading it to mistakenly attack both gluten and your own tissues, and this process is called molecular mimicry. This is one reason gluten can be especially harmful for people with autoimmune conditions like Hashimoto’s thyroiditis.
Why gluten and autoimmune disease don’t mix
If you’re living with an autoimmune disorder, eliminating gluten is one of the most powerful steps you can take. By reducing gut permeability, lowering inflammation and avoiding molecular mimicry, you’re giving your immune system space to calm down and regulate itself.
Getting started: How to go gluten-free
1. Start with what you can eat.
Focus on naturally gluten-free foods: meat, fish, eggs, fruits, vegetables, nuts, seeds, legumes, and gluten-free grains like rice, quinoa, or buckwheat. Shifting focus from restriction to abundance helps keep things positive and sustainable.
2. Learn the sneaky sources.
Gluten hides in places you wouldn’t expect — sauces, dressings, soups, soy sauce, even spice blends. Read labels carefully and look for “contains wheat” or “may contain gluten.”
3. Find your favorite swaps.
Try gluten-free pasta (brown rice, chickpea, or lentil), tortillas made from cassava or corn, and gluten-free, almond or coconut flour for baking. The options have come a long way; you don’t have to feel deprived.
4. Be mindful of cross-contamination.
Even small amounts of gluten can trigger a reaction for sensitive individuals. Use separate toasters, cutting boards and utensils if you live with others who eat gluten.
5. Support your gut while you transition.
A leaky gut can take time to heal. Add foods rich in prebiotics and probiotics, like garlic, onions, sauerkraut, kefir and yogurt (if tolerated). Bone broth and L-glutamine supplements can also help restore the gut lining.
6. Plan for eating out.
Most restaurants now have gluten-free options. Don’t be afraid to ask. Look for places that note “gluten-free kitchen” or “dedicated prep area” if you’re highly sensitive.
7. Don’t forget beverages and beauty.
Beer, flavored coffees, and even some makeup and skincare items can contain gluten. Choose gluten-free labeled brands whenever possible.
8. Track how you feel.
Keep a simple journal of meals and symptoms. Many people notice better digestion, energy, mood and skin clarity within a few weeks of removing gluten.
If you suspect gluten is affecting you, evidence-based testing can be helpful. I offer clients the following tests:
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- Cyrex Array 3 and Vibrant Wheat Zoomer test for immune reactivity to gluten and wheat proteins.
- Cyrex Array 4 looks at cross-reactive foods (like dairy, oats, corn, rice).
- MRT food sensitivity testing can help identify additional triggers that may be keeping your immune system on edge.
Final thoughts
Whether you have celiac disease, non-celiac gluten sensitivity, or an autoimmune condition, gluten can disrupt the gut and overwhelm the immune system. Eliminating it, along with identifying other food sensitivities, is a powerful way to reduce inflammation, restore gut health and support long-term wellness.
References:
1. Fasano, A., & Shea-Donohue, T. (2005). Mechanisms of disease: The role of intestinal barrier function in the pathogenesis of gastrointestinal autoimmune diseases. Nature Clinical Practice Gastroenterology & Hepatology, 2(9), 416–422. https://www.nature.com/articles/ncpgasthep0259
2. Fasano, A. (2012). Leaky Gut and Autoimmune Diseases. Clinical Reviews in Allergy & Immunology, 42(1), 71–78. https://link.springer.com/article/10.1007/s12016-011-8291-x
3. Tripathi, A., Lammers, K. M., Goldblum, S., Shea-Donohue, T., Netzel-Arnett, S., & Fasano, A. (2009). Zonulin, regulation of tight junctions, and autoimmune diseases. Annals of the New York Academy of Sciences, 1165(1), 62–67. https://pubmed.ncbi.nlm.nih.gov/19538307/
4. Lammers, K. M., Lu, R., Brownley, J., Lu, B., Gerard, C., Thomas, K., Rallabhandi, P., Shea-Donohue, T., Tamiz, A., & Fasano, A. (2008). Gliadin induces an increase in intestinal permeability and zonulin release by binding to the CXCR3 receptor. Gastroenterology, 135(1), 194–204. https://pubmed.ncbi.nlm.nih.gov/18485912/
5. van den Broeck, H. C., et al. (2010). Presence of celiac disease epitopes in modern and old hexaploid wheat varieties: Wheat breeding may have contributed to increased prevalence of celiac disease. Theoretical and Applied Genetics, 121(8), 1527–1539. https://pmc.ncbi.nlm.nih.gov/articles/PMC2963738/
6. Shan, L., Molberg, Ø., Parrot, I., Hausch, F., Filiz, F., Gray, G. M., Sollid, L. M., & Khosla, C. (2002). Structural basis for gluten intolerance in celiac sprue. Science, 297(5590), 2275–2279. https://pubmed.ncbi.nlm.nih.gov/12351792/
7. Fasano, A. (2020). All disease begins in the (leaky) gut: role of zonulin-mediated gut permeability in the pathogenesis of some chronic inflammatory diseases. F1000Research, 9, 69. https://f1000research.com/articles/9-69
8. Cordain, L., Eaton, S. B., Sebastian, A., Mann, N., Lindeberg, S., Watkins, B. A., O’Keefe, J. H., & Brand-Miller, J. (2005). Origins and evolution of the Western diet: health implications for the 21st century. The American Journal of Clinical Nutrition, 81(2), 341–354. https://academic.oup.com/ajcn/article/81/2/341/4607412