Bloating after a creamy pasta, stomach pain after a takeaway-style curry or a rush to the loo after breakfast can make one ingredient look guilty very quickly. Dairy, gluten, onions and spicy food often get blamed first. One meal, however, is not enough to diagnose a food intolerance. If digestive symptoms keep coming back, a short food-and-symptom diary can be genuinely useful. The trick is to use it to spot patterns, not as an excuse to keep removing foods until very little is left.

Record timing, not just what was on the plate

Writing down 'curry felt bloated' does not tell you very much. A more useful note includes roughly what you ate, when you ate it, when symptoms started and how long they lasted. It can also help to record bowel changes, medication, alcohol and anything unusual about the day, such as very poor sleep or a stressful event. The aim is not to create a perfect spreadsheet of every mouthful. You are looking for repeatable patterns. If the same type of symptom regularly appears a few hours after a particular food, that is more informative than one uncomfortable evening after a large meal.

A pattern still is not a diagnosis

Food intolerance can cause symptoms such as bloating, diarrhoea and stomach pain, but those symptoms are not unique to intolerance. Irritable bowel syndrome, coeliac disease, medication side effects and several other conditions can look similar at first.

That is why repeated self-testing can become misleading. Feeling better after removing a food may be useful information, but it does not always prove that the food itself was the underlying cause. Portion size, meal composition or another ingredient may have changed at the same time.

Avoid turning elimination into the default answer

Removing one suspected trigger for a defined period can form part of a proper assessment, often followed by reintroducing it to see whether symptoms return. Cutting out several major food groups at once is much harder to interpret and can make the diet unnecessarily restrictive.

Home intolerance tests sold online are also a poor shortcut. The NHS does not recommend many of these tests because evidence for their accuracy is limited and they can lead people to avoid multiple foods without good reason.

For family cooking, that matters. If one person suddenly avoids dairy, gluten and several vegetables based on an unreliable result, meals become more complicated without necessarily getting closer to the real cause.

Know when it stops being a recipe problem

Recurring digestive symptoms are worth discussing with a healthcare professional, especially if they are becoming more frequent or are accompanied by unexplained weight loss, blood in the stool, repeated vomiting or significant pain. A clinician may decide that blood tests, a breath test, another investigation or a physical examination is needed.

For non-urgent concerns, Doctoronline offers online medical consultations in which a registered doctor reviews the information provided and decides whether treatment is appropriate. An online consultation can be convenient, but it cannot replace tests or an in-person examination when those are necessary.

Possible allergy symptoms need a different level of urgency. Sudden swelling of the lips, mouth, tongue or throat, wheezing or difficulty breathing should be treated as an emergency rather than logged for later.

A good diary narrows the question. It should help you explain what is happening more clearly, not encourage you to diagnose yourself from the dinner table.