They can change it quite a lot. A pick-list makes common entries quick and tends to leave out whatever is not on the list. A pre-filled default can make the pre-filled answer the likeliest one to be saved. A required field can push you to enter something when the honest answer is “not sure”. None of this is a fault in itself, but it means the shape of the form is part of your data. The practical fix is to keep one free-text line for exceptions and to write “unknown” when you do not know.
This guide is for anyone choosing or using a diary app, a spreadsheet with drop-downs, or a template. It does not recommend a product, and it cannot say what any pattern in your diary means.
What the research does and does not show
No study has tested how pick-lists, defaults or required fields change what people record in a food-and-symptom diary. The nearest evidence comes from food-logging apps and from decision research, so it supports caution rather than a rule.
- Lists can miss real meals. A CHI 2015 study of food journaling (Cordeiro and colleagues) surveyed 141 current and former food loggers and analysed 5,526 forum posts about three calorie-tracking apps. People reported missing foods, duplicate entries with different values, and search results that did not match what they had eaten. Homemade food, and food eaten at restaurants, parties or other people’s homes, was harder to log than packaged food. The participants were self-selected and the work is qualitative, so it shows the kinds of problems people meet, not how often they occur. It concerns apps built around calories, not symptoms.
- What a form prompts for tends to be what gets recorded. In a validation study of the Dutch MijnEetmeter app (Ocké and colleagues, Nutrients, 2021), 100 adults used the app on three days and also gave telephone 24-hour recalls. Compared with the recalls, the app gave lower totals for drinks and added fats, and the authors suggest prompts for cooking fats and drinks might help. They note the recall method is not a true measure of intake and that both methods drew on the same food database. This was a dietary-intake study, not a symptom study.
- A pre-selected option is chosen more often, on average. A meta-analysis of 58 default studies (Jachimowicz and colleagues, Behavioural Public Policy, 2019) found that people were more likely to pick an option when it was pre-selected, with an average effect it describes as sizeable. Results varied widely between studies; several found no effect and two found a negative one. The studies were about choices such as enrolment and purchases, not diary entries, so they show that defaults can matter, not that they matter in your tool.
Taken together, the research is indirect. It is enough to justify checking how your own form behaves, and not enough to say that any design is better or worse.
Three features, and what each can change
Pick-lists (drop-downs, tags, “favourites”). They save time and make similar entries easy to compare, because “banana” is always written “banana”. The risk is the entry that is not on the list: a home-cooked dish, a restaurant meal, a drink you did not think to add. If the nearest item is chosen instead, the diary can look tidier than the meal was. The guide to recording a mixed meal shows a way to describe such meals in words.
Defaults (a pre-filled time, severity, portion or “no symptoms” answer). A default saves a tap and can become the answer by habit. A pre-filled “now” as the time can sit wrongly beside a meal eaten earlier; a default of “mild” can read like a rating you never gave. The guide to entries made at the time or afterwards explains why keeping the time of the meal apart from the time of writing matters.
Required fields. A form that will not save without a severity or a time pushes toward a guess. This is a practical concern rather than a cited research finding, so treat it as a reason to check, not as a measured effect. If you notice yourself picking something just to save, that is worth a note.
A short check for any diary form
Before you rely on a diary format, try these with a made-up day:
- Enter a meal that is not on the list. Can you describe it in your own words without forcing it into a similar item?
- Leave a field alone. Can you save an entry with “unknown” or a blank, or does the tool fill something in?
- Look for pre-filled values. Which fields start with an answer, and does the answer change when you reopen the entry?
- Find the notes line. Is there a place for a plain-words exception that stays attached to the entry and appears when you read it back?
- Check what is easy to skip. Drinks, cooking fats, sauces and snacks are the sort of details a form might not prompt for; the guides to water and other drinks and cooking oil and butter show why they are sometimes worth a short note.
Keep exceptions in plain words
A structured form is useful for the ordinary entries. Plain words are better for what does not fit:
- “Not on the list: shared takeaway curry, about half a portion.”
- “Time is a guess; I was out.”
- “Chose ‘mild’ because it was the first option; really not sure.”
Write the exception on the entry itself, not in a separate place you may not open later. If you realise a pick-list choice was wrong, correct the entry without erasing the original. If you change tools, keep the fields and wording the same so that days before and after stay comparable, and the comparison of paper, notes, spreadsheets and trackers looks at the trade-offs between formats.
What this means when you read the diary back
A form can make a diary look more consistent than the days were. If a food seems to appear in every entry, it may be the one that was easiest to select. If symptoms always read “mild”, check whether that was a default. Treat the form’s habits as one more reason a pattern could be partly an artefact of recording, and weigh it alongside what a good pattern summary should show.
GutBloom is designed so that corrections and uncertainty stay visible rather than being forced into a fixed answer. If you would like to try it, you can get GutBloom on Google Play.
When to speak to a professional
The shape of a diary matters less than the symptoms behind it. The NHS bloating page advises seeing a GP if you feel bloated regularly, still feel bloated after changing your diet, or have bloating with weight loss you did not intend or with blood in your poo. It lists other signs, such as bloating with vomiting, a stomach ache or a lump in your tummy, as reasons to seek urgent help. Do not wait for a tidier record before asking. The page was last reviewed on 21 January 2026, so check the current version.
This article has not been professionally reviewed and is not medical advice.
Sources
- NHS — Bloating
- Cordeiro and colleagues, CHI 2015 — Barriers and negative nudges: exploring challenges in food journaling
- Ocké and colleagues, Nutrients (2021) — Relative validity of MijnEetmeter: a food diary app for self-monitoring of dietary intake
- Jachimowicz and colleagues, Behavioural Public Policy (2019) — When and why defaults influence decisions: a meta-analysis of default effects