When it comes to weight loss, what you eat matters, but how consistently you eat may also play a role.
A study published in Health Psychology found that adults who followed more routine eating patterns, including repeating the same meals and maintaining a consistent calorie intake, lost more weight over 12 weeks than those whose diets were more varied.
Researchers analyzed food logs and daily weigh-ins from 112 adults enrolled in a structured weight loss program. Participants tracked everything they ate using a mobile app and recorded their weight using a wireless scale, allowing researchers to examine how eating patterns related to outcomes over time.
Those who repeated meals more frequently lost an average of 5.9% of their body weight, compared with 4.3% among those whose diets were more varied. Greater day-to-day consistency in calorie intake was also linked to better results. For every 100-calorie increase in daily fluctuation, weight loss decreased by about 0.6% over the study period.
“Maintaining a healthy diet in today’s food environment requires constant effort and self-control,” said lead author Charlotte Hagerman, PhD, of the Oregon Research Institute. “Creating routines around eating may reduce that burden and make healthy choices feel more automatic.”
The researchers measured dietary routine in two ways: how much calorie intake varied from day to day and how often participants repeated the same meals and snacks over time. Both forms of consistency were associated with greater weight loss.
The findings point to a potential benefit of simplifying food choices. Rather than constantly deciding what to eat, having a set rotation of meals may help reduce decision fatigue and make it easier to stick with a plan.
At the same time, the results do not suggest that dietary variety is inherently unhealthy. Previous research has linked greater variety within nutrient-dense food groups, such as fruits and vegetables, with better overall diet quality.
“If we lived in a healthier food environment, we might encourage people to have as much variety in their diet as possible,” Hagerman said. “However, our modern food environment is too problematic.”
The study also found that participants who logged higher calorie totals on weekends tended to lose more weight, which researchers said likely reflects more consistent tracking rather than increased intake.
Because the study was observational, it cannot show that repeating meals directly causes weight loss. Participants who followed more routine eating patterns may have differed in other ways, such as motivation or adherence to the program.
Still, the findings suggest that consistency, both in food choices and calorie intake, may be an important factor in building sustainable eating habits.
This study was funded by a U.S. government health research institute, the National Institute of Diabetes and Digestive and Kidney Diseases, which supports research on metabolic and digestive health.