Researchers are testing whether two types of phone reminders help people stick with logging their meals in an app. A 2026 microrandomized trial of 200 adults in Switzerland is comparing reminders about losing money rewards against reminders showing your logging streak. Results aren’t available yet, but the study could show which reminder strategy works best to keep people engaged with meal tracking over time.
Keeping track of what you eat is hard, and most people stop doing it after a few days. Researchers in Switzerland are testing whether clever phone reminders can help people stick with meal logging. According to Gram Research analysis, they’re comparing two types of reminders: one that warns you about losing money if you don’t log, and another that shows you how many days in a row you’ve logged meals. The study involves 200 adults over 28 days, and the results could help doctors and health apps get better information about what people actually eat.
Key Statistics
A 2026 randomized controlled trial of 200 adults in Switzerland tested reminder strategies for meal logging, with 76 participants completing the full 28-day study protocol as of August 2026.
Researchers compared three reminder types: loss-framing reminders (warning about losing daily rewards), consistency reminders (showing logging streaks), and neutral reminders, measuring whether participants logged meals within 2 hours of receiving a reminder.
The study used a microrandomized trial design that tested reminders repeatedly throughout the month rather than just comparing two groups, allowing researchers to identify which specific reminder strategies work best in real life.
The Quick Take
- What they studied: Whether two different types of phone reminders help people take pictures of their meals and log them in an app more consistently over a month.
- Who participated: 200 adults in Switzerland, age 45 and older, who were overweight (BMI of 25 or higher). As of August 2026, 76 had completed the full 28-day study.
- Key finding: The study is still collecting data and hasn’t published results yet, but researchers are testing whether reminders about losing money or reminders showing your logging streak work better than neutral reminders to keep people logging meals.
- What it means for you: If these reminders work, health apps and research studies could use them to get more accurate information about what people eat. This could lead to better health advice. However, results won’t be available until mid-2027.
The Research Details
This is a microrandomized trial, which means researchers randomly assigned reminders to participants many times throughout the study rather than just once at the beginning. Participants used a mobile app to photograph their meals at breakfast, lunch, and dinner for 28 days. Before each mealtime, the app randomly sent one of three types of reminders: a loss-framing reminder (warning about losing a daily money reward), a consistency reminder (showing how many days in a row they’d logged), or a neutral reminder (the control group). Researchers tracked whether people actually logged a meal within 2 hours of getting the reminder. Participants earned small daily financial rewards for completing their meal logs, which helped motivate them to participate.
Most people stop logging their meals after a few days, which makes it hard for doctors and researchers to understand how diet affects health. This study uses a smart research design that tests reminders repeatedly throughout the month rather than just comparing two groups. This approach is better at finding which specific reminder strategies actually work in real life, when people are busy and might forget.
The study has strong ethical approval from a Swiss ethics committee and uses a rigorous randomized design. The researchers are using advanced statistical methods (marginal excursion effect models) to account for changes over time and individual differences. However, the study is still ongoing as of August 2026, with results not expected until mid-2027. The study is limited to adults over 45 in Switzerland, so results may not apply to younger people or different countries.
What the Results Show
Results are not yet available. The study is still in the data collection phase, with 76 of 120 enrolled participants having completed the full 28-day protocol as of August 2026. Researchers expect to finish collecting data by January 2027 and publish results in the second quarter of 2027. The primary outcome they’re measuring is simple: did participants log a meal within 2 hours of receiving a reminder? This straightforward measure will show which reminder strategy works best at keeping people engaged with meal logging.
While the main results aren’t available yet, researchers will likely examine whether the reminders work differently for different types of people (for example, whether they work better for older adults or people with different BMIs). They may also look at whether the effectiveness of reminders changes over the 28 days, such as whether people get tired of them over time.
Previous research has shown that reminders based on loss-framing (the fear of losing something) and reminders about streaks or consistency can improve adherence to health behaviors. However, most of that research was done in lab settings or with simpler tasks. This study is one of the first to test these reminder strategies specifically for meal logging in real life using a mobile app, which is more practical and relevant to how people actually use health technology.
The study is limited to adults over 45 with a BMI of 25 or higher in Switzerland, so results may not apply to younger people, people of normal weight, or people in other countries. The study only measures whether people log meals, not whether the reminders actually change what they eat or improve their health. The financial rewards offered in the study may not reflect real-world use, where people might not get paid to log meals. Results are not yet available, so we cannot assess how well the reminders actually worked.
The Bottom Line
Wait for the full results in mid-2027 before making decisions based on this research. Once published, these findings could help health app developers and researchers design better reminder systems. If you’re trying to log your meals now, any consistent reminder system is likely better than no reminder at all. Moderate confidence: this is preliminary research still in progress.
Health app developers, researchers studying diet and disease, doctors who want better dietary information from patients, and anyone struggling to keep track of what they eat. People under 45 or with a normal BMI should be cautious about applying these findings to themselves until broader research is available.
The study will be complete by January 2027, with results published by June 2027. If the reminders work, it could take another 6 to 12 months for app developers to incorporate these strategies into their products.
Frequently Asked Questions
Do phone reminders actually help people log their meals?
This study is testing exactly that question. Early research suggests reminders about losing rewards or showing your logging streak may work, but final results won’t be available until mid-2027. Any reminder is likely better than no reminder.
What type of reminder works best for meal logging?
Researchers are comparing loss-framing reminders (warning about losing money) against consistency reminders (showing your streak). Results aren’t published yet, but both approaches are based on proven psychological strategies for changing behavior.
How long does it take to see results from meal logging reminders?
This study measured whether people logged meals within 2 hours of getting a reminder, so the effect is immediate. However, whether reminders help people stick with logging for weeks or months is still being studied.
Can I use these reminder strategies in my own health app?
Once results are published in mid-2027, app developers will likely incorporate these strategies. For now, set reminders before your usual mealtimes and try tracking your logging streak to stay motivated.
Who should use meal logging reminders?
This study focused on adults over 45 who are overweight. Results may work for other groups, but the research is specifically designed for older adults managing their weight through dietary awareness.
Want to Apply This Research?
- Track the number of consecutive days you log all three meals (breakfast, lunch, and dinner). This creates a visible streak that the research suggests may motivate continued logging.
- Set up automatic reminders 15 minutes before your usual mealtimes. Start with just one meal per day (breakfast is easiest) and add lunch and dinner once the habit sticks.
- Review your logging streak weekly. If it drops below 5 days, adjust your reminder time or add a second reminder. Track which time of day you’re most likely to forget and prioritize reminders for that meal.
This study is still in progress and results have not yet been published. The findings described here are based on the study protocol, not actual results. Do not make health or dietary decisions based on this research until final results are available in mid-2027. This research is limited to adults over 45 with a BMI of 25 or higher in Switzerland and may not apply to other populations. Meal logging reminders are a tool to improve dietary awareness but should not replace personalized medical advice from your doctor or registered dietitian.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.