The researchers think this could be for a variety of reasons. One option is, of course, that highly motivated people who are likely to keep up with a regular food diary are the kind of folks who are likely to do well on any kind of weight loss treatment, regardless of how long each entry takes them to make. But diet researchers think there could be more to it than that. For one thing, frequent monitoring probably makes you more aware of what you’re eating and how that affects your weight, which makes it easier to make better nutritional choices on the fly. It’s easy to tell yourself that half a bar of chocolate each night is an innocent treat, and another to write down that you're eating it and see how it affects your progress—even if you don't do a full breakdown of its exact caloric content.