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Published Keeping a useful diary

How to Move a Food and Symptom Diary From Paper to an App Without Breaking Comparison

Written by
GutBloom Team
In this article
  1. What research does and does not say about switching
  2. What to keep the same
  3. What tends to change without you noticing
  4. A low-effort way to switch
  5. Reading a diary that has a switch in it
  6. If you are moving to GutBloom
  7. When to speak to a professional
  8. Sources

You can change format without losing the thread, as long as you change how you record, not what a record means. Keep the same fields, the same wording and the same rating routine, write down the date of the switch, and treat the days before and after it as two stretches of one diary rather than as a single unbroken series. Old entries stay as they were written.

This guide is about the practical mechanics of moving between formats, for example from a notebook to a notes app, a spreadsheet or a tracker. It does not recommend a format (the comparison of paper, notes apps, spreadsheets and trackers does that for the choice itself), and a diary of any kind shows sequence rather than cause.

What research does and does not say about switching

No study has tested what happens when someone moves a personal food-and-symptom diary from one format to another. The nearest evidence comes from clinical research on questionnaires, and it supports caution about changes rather than a precise rule.

  • Small changes versus large ones. The ISPOR task force report on moving patient-reported measures from paper to electronic form (Coons and colleagues, Value in Health, 2009) says that how much testing is needed depends on how much the change could affect the content, meaning or interpretation of the items and scales. Changes to wording or response scales matter more than changing the screen. This was guidance for researchers running clinical studies, not for personal diaries, and the abstract is the part this article relies on.
  • Faithful copies tend to agree. A systematic review of 72 studies (Muehlhausen and colleagues, Health and Quality of Life Outcomes, 2015) found that answers to questionnaires given on paper and on electronic devices generally agreed well (pooled correlation 0.88), although results varied a great deal between studies. Agreement was higher when the two versions were completed less than a day apart. One author worked for an electronic-diary company and the others for a clinical research organisation. The review concerns validated questionnaires, not free-form diaries, and it measures agreement of answers rather than whether people keep recording.
  • Electronic records can be easier to keep close to the time. A 2016 pilot study of 11 adults with irritable bowel syndrome used a smartphone food-and-symptom journal for two weeks. Eight of the 11 met the researchers’ feasibility thresholds. There was no paper comparison, the group was tiny and likely more comfortable with technology than average, and participants found the app time-consuming. A 21-day study of 80 people with chronic pain (Stone and colleagues, 2003) found that sensor-tracked paper diaries were rarely completed at the assigned times, while a time-stamped electronic diary recorded much higher actual compliance. That is one trial in chronic pain with fixed entry times, so it says little about a notebook kept for personal use.

Taken together: a switch is unlikely to be a problem in itself, but changing what you ask yourself or how you answer can change what your entries mean. That is the part you control.

What to keep the same

Before you move, list what your current diary records and decide what must carry over unchanged. A short list is enough:

  • The fields. If your paper pages have time, food or drink, symptom, and a notes line, the new format should have the same. The free diary template shows one set of columns you can copy into a spreadsheet or app.
  • The wording. If you wrote “mild”, “moderate” and “strong”, keep those words instead of switching to a 1 to 5 slider because the app offers one. The guide to describing symptom severity in plain words explains why one steady rule matters more than which scale you use.
  • The time convention. Decide whether you record the time of the meal and the time of the symptom separately, and keep doing so. Some apps stamp the moment you typed an entry; that is not the same as when you ate. The guide to entries made at the time or afterwards covers keeping the two apart.
  • Your “unknown” marks. If you used a question mark or the word “unsure” for details you did not know, carry that over rather than letting a default value fill the gap.

What tends to change without you noticing

Any tool nudges what you record. Check these before assuming the old and new records match:

  • Defaults and pick-lists. A drop-down of common foods can make an entry faster, but a food that is not on the list may stop being recorded.
  • Reminders. Prompts can change when you record, and therefore how well you remember.
  • Free text becomes fixed fields, or the reverse. Details you used to add in a margin may have nowhere to go.
  • Required fields. If the tool insists on a severity before you can save, you may start guessing.
  • Photos and templates. A photograph prompt, for example, adds a memory aid but cannot show portion or ingredients precisely, as the guide to meal photographs explains.

If you notice a change, you do not need to fix it perfectly. Write it in your notes with the date.

A low-effort way to switch

  1. Set the new format up to match the old one. Create the same fields and the same wording before you enter anything.
  2. Choose a switch date and write it down. Put “Format changed: paper to app” on the last paper page and the first entry in the new tool.
  3. Optionally overlap for a few days. Recording a few days in both formats shows whether the new tool is missing details you usually note. This is a practical check, not a validated method, and it doubles the effort, so skip it if it would make you stop recording.
  4. Do not retype old entries. Rewriting pages from memory or tidying them for the new format risks changing them. If you want everything in one place, add a photograph or scan of the paper pages instead, or keep the notebook alongside the app. If you spot a mistake in an old entry, the guide to correcting an entry without erasing the original shows how to flag it.
  5. Check that you can get your data out. Health information is sensitive. Before moving to an app, read what it collects and whether you can export and delete your records. The privacy checks before using a health diary app set out the questions.

Reading a diary that has a switch in it

Treat the switch date as a marker, much like a gap. If your symptoms seem to change soon after it, that could reflect many things, including a difference in what you now remember to record. It does not show that the app, or any food, caused the change.

  • Compare days within the same stretch first, before comparing across the switch.
  • Be wary of a sudden rise or fall in the number of entries, symptoms or “no symptoms” days near the switch date; it may reflect how you record rather than how you feel.
  • If a pattern only appears across the switch and not within either side, treat it as unconfirmed.

The same caution applies to stretches with no entries, covered in the guide to missing symptom check-ins, and to the broader question of what a diary with no clear pattern means.

If you are moving to GutBloom

GutBloom is an Android app that treats meals and symptom check-ins as equal parts of one daily record, with AI-assisted meal capture that you confirm or correct. The steps above apply if you move into it as well: keep your paper record as it is and start the app record on a clearly marked day. If lower-effort recording appeals, you can get GutBloom on Google Play.

When to speak to a professional

A tidy diary is not a prerequisite for getting advice. The NHS bloating page says to see a GP if you feel bloated regularly, still feel bloated after changing your diet, or have bloating with unintentional weight loss or blood in your poo. It lists other combinations, such as bloating with a stomach ache, vomiting, or a lump or swelling in your tummy, as reasons to seek urgent help, and a sudden severe stomach ache with a swollen stomach as an emergency. The page was last reviewed on 21 January 2026, so check the current version. If you share a diary, mention the date you changed format so the clinician can read it correctly.

This article has not been professionally reviewed and is not medical advice.

Sources