What should you know about a comprehensive food intolerance test?

Food intolerance describes difficulty digesting or processing a food, often causing symptoms such as bloating, abdominal discomfort, wind, or diarrhoea. Testing may involve a detailed history, a food and symptom diary, a supervised elimination and reintroduction plan, or a specific breath test when a particular intolerance is suspected. Some commercial panels measure immune markers that do not reliably prove an intolerance. A result should therefore be matched against what happens when the food is eaten and removed safely. A positive-looking report does not by itself explain every digestive symptom.

Record meals, portion sizes, symptoms, timing, medicines, and bowel changes before the appointment. Do not remove many foods at once, because this can make the pattern harder to interpret and may reduce nutritional variety. If a clinician recommends an elimination period, follow the planned duration and reintroduce foods one at a time. Seek nutrition support if dairy, wheat, several fruits, or other staples are being restricted. Testing for coeliac disease can be affected by avoiding gluten, so discuss the sequence before changing your diet.

Arrange medical review for persistent symptoms, unexplained weight loss, blood in the stool, repeated vomiting, fever, or symptoms that wake you at night. Get urgent help for severe or rapidly worsening abdominal pain, fainting, marked weakness, or signs of dehydration such as very little urine. A clinician can check whether another condition is contributing instead of assuming food intolerance is the explanation.

Which foods should I keep eating before testing? What test fits my symptoms and what would its result mean? How will we reintroduce a food safely? Do I need nutrition counselling if my diet becomes restricted?