Many people think they eat at almost the same time every day. But a large study published on April 23, 2026 suggests that real life is much less regular. Researchers analyzed more than 2.5 million food and drink records from 21,006 adults who used the myCircadianClock app for two weeks. They found big differences not only in what people ate, but also in when they ate it. (nature.com)

One important measure in the study was the “95% eating window,” or the period that covered almost all of a person’s eating and drinking. On average, this window was 13 hours 29 minutes. In the shortest group, it was about 10 hours 54 minutes, but in the longest group, it reached 16 hours. Even more surprising, only about 1 in 20 participants kept a truly consistent schedule, with the times of their first or last calories shifting by less than one hour across the two weeks. More than half of the users still finished eating after 8:00 p.m. (nature.com)

Lifestyle also mattered. Younger adults tended to start eating later and had slightly longer eating windows than older adults. Night-shift workers had the most irregular pattern: their eating was spread across the day and night, and their average eating window was about 18 hours. This shows how strongly work and daily routines can shape meal timing. (nature.com)

The clock also matched certain foods. In the morning, people often logged coffee, milk, eggs, bananas, yogurt, and toast. In the late evening, beer, wine, and ice cream became more common. So our meal times are not only about hunger—they may also reflect work, age, habits, and social life. (nature.com)

The researchers did not say this study proves which meal schedule is best for health. Still, the message is clear: our eating habits are often more flexible and more irregular than we imagine. If you think your breakfast, lunch, and dinner are always “on time,” this study suggests you may want to check again. (nature.com)