Diagnosis of food intolerances and allergies It is important to emphasize that only a doctor can diagnose a food intolerance or allergy. A well-founded diagnosis is not a simple undertaking and requires a great deal of knowledge and experience. It is therefore advisable to consult a suitably trained doctor. Other professional groups or providers of self-tests are not … [Read more...] about Nutritional advice for food intolerance: what you need to know