One of the most common questions I hear from patients lately is about the gluten free diet. Many want to know if going gluten free can help with weight loss, low energy, bloating, constipation, or heartburn. The conversation around gluten is everywhere. Some of the information is accurate, but a lot of it is based on rumor or advertising.
So what exactly are Celiac disease, gluten intolerance, and gluten sensitivity?
Celiac disease is an autoimmune condition that affects about 1% of the population. When patients with Celiac disease eat gluten, their immune system reacts by damaging the small intestine. Gluten is a protein found in wheat, rye, and barley. For people with this condition, avoiding these foods is essential. Even small amounts can cause illness.
Gluten intolerance, sometimes called non-Celiac gluten sensitivity, is different. It may affect as many as 10% of people. Symptoms can be milder than Celiac disease and may involve more than just the gastrointestinal tract. Definitions of gluten intolerance have shifted over time as we learn more, but the general idea is that some people feel unwell after eating gluten even without the intestinal damage seen in Celiac disease.
The small intestine’s main job is absorbing nutrients from food. In Celiac disease, that lining gets damaged, which makes it harder for the body to take in vitamins and minerals. Symptoms can include diarrhea, abdominal pain, gas, weight loss, and deficiencies in iron or vitamins. Some patients develop related conditions, such as osteoporosis or thyroid disease. Celiac disease is also linked to dermatitis herpetiformis, a very itchy rash that can form on the elbows, knees, or back.
There’s even an increased risk of intestinal lymphoma in patients with untreated Celiac disease. While this cancer is rare, the risk decreases when gluten is eliminated from the diet.
So how do we test for Celiac disease?
The most definitive test is a biopsy of the small intestine, usually done during an endoscopy. Blood tests can also help, such as tissue transglutaminase antibody (TTG) or endomysial antibody (EMA). These are often used in a Celiac panel. Your doctor can help decide which test makes sense based on your symptoms.
There isn’t a test for gluten intolerance. If blood work and biopsy are normal but symptoms improve on a gluten free diet, that’s sometimes how the diagnosis is made.
Celiac disease appears to have a genetic component. It’s more common in patients with European ancestry, as well as in parts of the Middle East, North Africa, and South Asia. It is rare in populations from northern Asia and southern Africa.
Treatment is simple in theory but difficult in practice. The only effective treatment is to completely avoid gluten. About 70% of patients feel better within two weeks of eliminating gluten. Antibody levels in the blood often return to normal as well. But gluten is in many foods, and avoiding it requires major lifestyle changes. It’s not just bread and pasta. Gluten can hide in supplements, sauces, and processed foods.
A dietician who specializes in Celiac disease is often the best partner for patients making these changes. They can help identify hidden sources of gluten and ensure nutritional needs are still being met. That’s important because gluten free foods often contain less iron, vitamin D, and B vitamins. Some processed gluten free products add extra sugar or fat to make up for texture.
Patients sometimes ask if they should just “try going gluten free.” I usually recommend testing first if symptoms suggest Celiac disease. That way, you don’t lose the chance to confirm the diagnosis. If the tests are negative, you can still try eliminating gluten to see if you feel better, but do it with support from a healthcare provider or dietician.
Practical considerations matter. Many people with Celiac disease also need extra calcium and vitamin D, and sometimes blood tests for iron, folic acid, or B12. Osteoporosis can be a risk, so bone density testing may be appropriate. Dairy intolerance is also common until the intestine heals.
Some naturally gluten free foods include rice, corn, potatoes, beans, nuts, seeds, and soy. Foods to avoid are wheat, rye, barley, malt, brewer’s yeast, and most oats unless specifically labeled gluten free. Most wines are safe, but most beers are not.
Gluten intolerance and Celiac disease are real conditions, but gluten isn’t harmful for most people. It’s important to understand why a gluten free diet might be necessary and not assume it’s a guaranteed path to better health.
For more information:
This is for educational purposes only. If you think you may have Celiac disease or gluten intolerance, talk with your healthcare provider.
Scott Rennie, D.O.
Board Certified in Obesity Medicine and Family Medicine
This blog is for educational purposes only and does not constitute individual medical advice. Always consult your own physician before making changes to your health, medications, or treatment plan.
Reference: Ciclitira PJ, King AL, Fraser JS. AGA technical review on Celiac Sprue. Gastroenterology 2001;120:1526.
Doctor Rennie's Blog 