Food Symptom Diary: Free 14-Day Template and Guide
A diary can help you and a qualified clinician see details that are hard to remember later. It is an observation tool: many factors can occur together, and a repeated pattern still does not prove that one food caused a symptom.
Download the free diary template
The CSV opens in Excel, Numbers, Google Sheets, and most spreadsheet apps. Delete the example row before you start.
Download the 14-day CSV templateWhat to record
| Field | What to write | Why it helps |
|---|---|---|
| Food and time | Meal, drink, ingredients, approximate portion, and time | Creates a sequence to compare with later symptoms |
| Symptom | Type, severity from 0–10, and onset time | Makes separate symptom episodes comparable |
| Daily context | Sleep, stress, activity, caffeine, and alcohol | Surfaces plausible non-food explanations |
| Other context | Medication, supplements, illness, menstrual cycle if relevant, and unusual events | Reduces false conclusions from a single variable |
A practical 14-day workflow
- Days 1–4: observe your normal routine. Do not intentionally change several habits. Log during or soon after meals and again when a symptom occurs.
- Days 5–11: keep recording consistently. Review the diary for repeated timing and symptom patterns. If a clinician recommends testing one change, keep other routines as steady as practical.
- Days 12–14: summarize, do not self-diagnose. Mark repeated associations, possible alternative explanations, and questions to bring to a doctor or dietitian.
Reintroduction can be unsafe for suspected allergies and is not appropriate for every condition. The NHS advises speaking with a GP or dietitian before cutting foods from your diet, and a clinician should decide whether and how a food should be reintroduced.
How to review the diary without overclaiming
- Group entries by one symptom, such as bloating or headache, instead of combining every complaint.
- Compare onset timing. A same-day association and a next-day association are different observations.
- Look for repetition across separate days, then check whether sleep, stress, alcohol, activity, or illness changed too.
- Write the conclusion as a question: “Does X repeatedly precede Y?” rather than “X causes Y.”
Common diary mistakes
- Reconstructing the whole day from memory at night
- Changing several foods or habits at the same time
- Recording foods but not symptom onset or severity
- Ignoring sleep, stress, activity, medication, or illness
- Using one episode as proof of an intolerance
- Continuing a restrictive diet without professional guidance
When to share the diary with a clinician
Bring the diary to a medical appointment when symptoms recur, affect daily life, follow weight loss, or you are considering a restrictive diet. A concise summary helps: list the symptom, the dates it appeared, the suspected exposure, timing, severity, and competing explanations.
Frequently asked questions
What should I record in a food symptom diary?
Record the meal or drink, ingredients and portion, time, symptom and severity, onset time, sleep, stress, activity, caffeine, alcohol, medications or supplements, and notes.
Can a food diary diagnose an intolerance or allergy?
No. It can organize observations and help a qualified clinician understand recurring patterns, but it cannot diagnose an intolerance, allergy, or another medical condition.
How long should I keep a food symptom diary?
Fourteen days is a practical starting period for consistent observation. A clinician may recommend a different duration based on your symptoms and circumstances.
Sources and review notes
This guide was checked on August 30, 2026 against the NHS food intolerance guidance and the American Academy of Allergy, Asthma & Immunology guidance on elimination-diet risks. It provides general educational information and does not replace medical care.
Prefer a guided digital log? Burn is a self-observation tool for focused experiments; it does not diagnose medical conditions.
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