Consistent meal logging drives major weight loss in app users

The people who log their meals most days of the week lose the most weight. This is the central finding of a peer-reviewed study of 5132 MyNetDiary users, published on August 13, 2026, in the Journal of Medical Internet Research. Over 6 months, users who tracked food 6-7 days per week lost 11.33% of their body weight on average, about two-thirds more than the 6.84% among users tracking fewer than 2 days per week.

The more days tracked consistently, the higher chance for significant weight loss

The association followed a staircase pattern, showing how outcomes improved at every step of tracking frequency. Each additional tracking day per week was associated with 35% higher odds of clinically significant weight loss, defined as losing at least 5% of body weight, which is the threshold that clinical guidelines tie to meaningful health improvements (adjusted odds ratio [aOR] 1.35, 95% CI 1.31-1.40; adjusted for age, sex, and starting BMI).

The result that surprised the researchers was that consistency mattered more than perfection. Users who tracked just 2-3 days per week still lost 7.35% of body weight on average, and more than half of them reached the clinically significant threshold. Missing days did not erase the benefit.

Longer streaks, bigger losses

Users who built daily logging streaks longer than 90 days lost 11.55% of body weight on average, with 81.2% reaching clinically significant loss. On the other hand, users whose longest streak was a week or less lost 4.21% of body weight, with 42.3% reaching clinically significant loss. 

Overall results: 7 in 10 engaged users reached clinically significant loss

Across the full cohort in the study (mean age 42.1; 72.8% women), the average user lost 9.3 kg (about 20.5 pounds, or 9.5% of body weight), with 70.1%, or roughly 7 in 10, losing at least 5% and 44.8% losing 10% or more of their body weight. The cohort was selected for engagement, that is, every user in it had a weight-loss goal, logged food regularly, and recorded a weight at least monthly.

Sergey Oreshko, cofounder and CEO of MyNetDiary and the first author explains, "The data says something that people trying to lose weight need to hear–you don't need a perfect record. In our study, every extra day of tracking per week was associated with better odds, and even two or three days a week made a real difference.'

Dietitians have recommended food journaling for decades, and this shows how consistency can pay off in the real world. Every additional day of tracking per week mattered. Whether or not someone is using a weight-loss medication, dietary self-monitoring remains the foundation. And if you fall off for a few days, the message from this data is simple: just pick it back up."

Susan Heikkinen, MS, RDN, CDCES, co-author and MyNetDiary-registered dietitian nutritionist

The authors are direct about the study's limits. As an observational study, it demonstrates association rather than causation; more motivated users may both track more and lose more. The cohort was an engaged subset, about 1.2% of new signups (roughly 1 in 80), and the results describe that group rather than all app users. Medication use, including glucagon-like peptide-1 (GLP-1) receptor agonists, was not measured and may account for part of the observed loss. As the study was conducted by MyNetDiary's own team, conflicts of interest are disclosed in the paper, and an anonymized user-level dataset sufficient to replicate the primary analysis has been published with it.