People who ate the same meals on repeat lost more weight than those who varied their food choices, according to a study recently published in the journal Health Psychology.
The research analyzed detailed food logs from 112 adults with overweight or obesity enrolled in a structured behavioral weight loss program. Participants tracked everything they ate through a mobile app and weighed themselves daily on a wireless scale. Researchers focused on the first 12 weeks, the period when participants tend to be most engaged and their data most accurate.
The team measured dietary routine in two ways: caloric stability, meaning how much daily calorie intake fluctuated from day to day and between weekdays and weekends, and dietary repetition, meaning how often participants logged the same meals and snacks over time.
The results showed a clear pattern. Individuals who repeated the same foods lost an average of 5.9% of their body weight. Those who ate a wider variety of foods lost an average of 4.3%. The researchers also found that calorie fluctuation played a direct role. For every 100-calorie increase in daily variation, weight loss decreased by roughly 0.6% over the study period.
The study was observational and relied on self-reported data within a highly structured program, which limits how broadly the findings can be applied. A real-world diet does not come with daily weigh-ins and app-based food tracking built in.
Kristin Kirkpatrick, a registered dietitian at the Cleveland Clinic Department of Wellness and Preventive Medicine who was not involved in the study, offered a measured take. "There's compelling evidence to consider here that consistency and predictability in eating may help some individuals eat better and lose weight," she said, while pointing to the study's reliance on self-reported data and structured program design as important caveats.
She also raised a concern about the quality of what gets repeated. "Consistency works best when the foundation is strong. If meals are nutrient-dense, they can reinforce high quality nutrition. But if they're missing key nutrients, you may consistently fall short." She added that for many people, the level of routine the study describes is hard to maintain. "In the real world, with travel, stress, and changing schedules, that level of consistency isn't always realistic without structure or support."
The findings suggest that reducing decision fatigue around food, essentially choosing a handful of reliable meals and returning to them, could be a practical strategy for people trying to lose weight within a structured setting. Whether that approach translates outside a clinical program is a question the study does not answer.
