How to Keep a Food and Symptom Diary Without Cutting Out Foods

A useful diary records what happened, rather than deciding which food is to blame. If bloating, abdominal discomfort or changes in your bowel routine keep returning, a short record can make a conversation with a GP or registered dietitian more specific. It cannot diagnose a food intolerance or replace an assessment.

What is the diary for?

Think of it as a memory aid. Instead of trying to remember an entire week at an appointment, you can bring a few clear examples. The US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) describes food and symptom diaries as one part of assessing gas symptoms, alongside medical history, examination and sometimes tests.

Keep the entries simple

Use a notebook or a private note on your phone. Record:

• Food and drink: time and rough portion, including snacks.
• Symptoms: what you noticed, when it started and how long it lasted.
• Bowel movements: time and whether the stool was hard, formed or loose.
• Medicines and supplements: what you took and when.
• Context: brief sleep or stress notes, if relevant.

These fields draw on an NHS dietetic diary and NIDDK's description of clinical assessment. Everyday portions are enough; this is not a calorie-counting exercise.

A short template you can copy

Date and time: ______
Food, drink and approximate amount: ______
Symptom, start time and duration: ______
Bowel movement and stool description: ______
Medicines/supplements and time: ______
Other relevant context: ______

The NHS example uses one week. That can be a manageable starting point, not a diagnostic deadline or a reason to delay seeking care. Follow your GP or registered dietitian's instructions if they ask for a different period. Keep entries brief and include days when you feel well.

Look for questions, not verdicts

After a few entries, ask: did the same pattern recur, or was this one unusual day? Did meal size, a change in routine or a new medicine also differ? A symptom after a meal does not by itself identify the responsible ingredient.

Bring the record to your appointment and explain what is affecting daily life. If there is no obvious pattern, that is still useful information. You have not failed the exercise, and it does not mean the symptoms are imaginary.

Do not turn the diary into a restriction plan

Recording a meal is not a reason to remove it. The NHS advises against cutting foods out without medical or dietetic advice, because important nutrients can be lost. This applies especially to children. Continue any existing medically prescribed diet, and do not stop prescribed medicines to test a theory.

If a restricted diet is appropriate, get an individual plan and a way to review it. NICE recommends specialist dietary support for people with diagnosed IBS considering further dietary changes after initial advice has not helped. A diary entry alone is not an IBS diagnosis or a reason to start a low-FODMAP diet.

When to seek help instead of keeping more notes

Contact your GP if bloating keeps returning or does not go away, particularly with unexplained weight loss or blood in your stool. Seek urgent advice for bloating with vomiting, fever, abdominal pain or inability to pass stool or wind. Sudden severe abdominal pain, vomiting blood or severe breathing difficulty needs emergency help. Use your local urgent-care or emergency service in the UK or Ireland; do not wait to finish the diary. See NHS bloating guidance.

Keep learning

For more on interpreting symptoms, read Does bloating after eating mean a food intolerance?

Educational information for adults, not individual diagnosis or treatment. Sources checked 15 October 2026. No supplement is required to keep this diary.