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If bread or pasta seems to trigger symptoms, switching to gluten-free food can feel like the obvious next step. If coeliac disease is a possibility, speak with your GP first. Changing what you eat before testing can make the results harder to interpret.
Why your current diet matters
Coeliac disease is an immune condition in which gluten damages the lining of the small intestine. Blood tests look for antibodies associated with that response. If you have already cut down or stopped eating gluten, antibody levels can fall and the gut lining can begin to heal. This can make a blood test or biopsy less reliable for ruling out the condition.
Plan the testing with your GP
Tell your GP when your symptoms started, whether a close relative has coeliac disease, and what you have already changed about your diet. If you still eat gluten, ask whether to keep your usual diet until testing is complete. A positive screening blood test generally needs specialist assessment to confirm the diagnosis. Ask what happens next before starting a gluten-free diet.
If you are already gluten-free, tell your GP how long that has been the case. The next step depends on your history, previous results and symptoms. A clinician may discuss a supervised gluten challenge or other tests. Do not restart gluten on your own if you have diagnosed coeliac disease, a known wheat allergy, or medical advice to avoid it.
Improvement after a swap does not identify the trigger
Changing from wheat bread to another food also changes ingredients such as fructans, serving size and sometimes fibre. Feeling better does not establish which change mattered. Coeliac disease, wheat allergy and sensitivity to some fermentable carbohydrates need different approaches. Our gluten-free and low FODMAP guide explains why those labels are not interchangeable.
What to take to your appointment
- When you last ate gluten regularly, and what you currently eat.
- Any previous coeliac test results and relevant family history.
- A brief note of symptoms and their timing, using our food and symptom diary guide if helpful.
If coeliac disease is confirmed, your care team can help you follow a strict lifelong gluten-free diet and arrange appropriate follow-up. Digestive enzyme supplements do not make gluten safe for someone with coeliac disease.