“Soup and bread” tells you what lunch was. It may not tell you which ingredients were in it, how much you ate or when you noticed symptoms. A little extra detail makes your food diary easier to review later.
You do not need to type every label from scratch. Barcode tools can help you find product information, while a phone photo keeps a record of the pack you actually used. The useful part is connecting those details to what you ate—not collecting a long list of scanned products.
Three practical ways to get started
| Tool | What it helps with | What you still need to do |
|---|---|---|
| Open Food Facts | Free, community-maintained product lookup using a barcode, with product information where available. Its app is available for Android and iPhone. | Check the exact product against your current pack. Database entries can be incomplete or out of date. Keep a label photo if information is missing. |
| Cronometer | Its free mobile barcode scanner helps you find a food, choose a serving size and add it to a nutrition diary. | A nutrition entry is not a complete ingredient record. Keep ingredients and symptom notes separately where needed. Timestamped diary data is listed as a Gold feature, so do not assume the free version records the meal times you need. |
| Phone camera or notes, with optional ChatGPT | Photograph the ingredients, then use your own notes or ask ChatGPT to turn checked text into a diary table. Free ChatGPT supports image uploads, subject to usage limits. | Check every transcription against the label. Save your own diary copy; do not rely on a chat remembering everything. You can always paste or type the label text instead. |
None of these options needs to replace your existing diary. Choose the easiest way to keep enough detail consistently. You can transfer information manually; this guide does not assume an automatic connection between these apps and TMFS.
The routine: scan, check, record
Before you start, distinguish the two panels on a pack. The ingredients list names what went into the product; the nutrition panel gives information such as energy, fat and protein. Saving a calorie entry alone will not preserve the full ingredient list you may want to refer to later.
1. Identify the exact product. Scan its barcode or photograph the front and ingredients panel. Check the flavour, size and country version. Similar packaging does not guarantee an identical recipe.
2. Check the pack you used. Treat a database entry as a shortcut to check, rather than the final word. Recipes change. If a label is blurry, take another photo. Mark anything you cannot read as unknown instead of guessing. For allergy information, use the current pack and appropriate professional advice; an app score is not confirmation that a food is safe for you.
3. Record what you actually ate. Add the date, meal time and portion to your diary. Include sauces, toppings, drinks and substitutions that a barcode cannot capture. For a homemade meal, note the recipe and relevant packaged ingredients.
4. Add symptoms separately. Record what you noticed and when, including occasions when you felt fine. The ingredient list describes the food; it does not establish which ingredient caused a symptom.
5. Keep the source. Save the label photo with a simple name, such as “Monday lunch soup,” and refer to it in the diary. On paper, you can write the key details and keep the photograph on your phone. Digitally, copy the checked information into your diary or spreadsheet.
A worked example
This is a fictional entry, not a real product label or a suggested meal:
| Field | Example |
|---|---|
| Date and meal time | Monday, 12:30 |
| Food and portion | Vegetable soup, half the pack |
| Ingredients checked on pack | Water, carrot, potato, onion, vegetable oil |
| Other food or drink | One slice of bread; bread label saved separately |
| Source | Photo: Monday lunch soup |
| Symptoms and timing | None at lunch; mild bloating noted at 15:00 |
This is more useful than “soup caused bloating.” It preserves the observation without turning one meal into a conclusion. If an ingredient is unreadable, write “unclear on photo—check pack.”
A ChatGPT prompt you can copy
Help me format a food diary entry from this label and my notes. Transcribe only text you can read; mark unclear words and ask me to check them. Do not invent ingredients. Create a table with date, meal time, product, portion, verified ingredients, source photo, symptoms and symptom time. Leave missing details blank and ask me for them. Do not infer a cause, diagnose a condition or suggest foods to eliminate.
Check the result before saving it. You can use initials or an anonymous diary and leave out personal details that are not needed. If an upload limit prevents a photo, paste the ingredient text or use your phone’s notes instead.
Where a test fits
If you have chosen a TMFS At-home Hair Sensitivity Test, start your diary while waiting for your results and keep it going afterwards. Record foods, ingredients, portions and how you feel, so you have clear everyday notes to review alongside your personalised report. You can also start a diary at any time.
For persistent symptoms, or before significant or prolonged dietary restriction, speak with a GP or dietitian. Bring your checked diary rather than relying on a scanner score or an AI interpretation.
Start with our food and symptom diary template, then add the ingredient details that make it useful for you.
