From a Good Housekeeping article posted on WebMD -
"When researchers from Kaiser Permanente Center for Health Research followed more than 2,000 dieters who were encouraged to record meals and snacks, they found that the single best predictor of whether a participant would drop weight was whether the person kept a food diary. It trumped exercise habits, age, and body mass index. The number of pounds people lost was directly related to the number of days they wrote in their log. (It's no coincidence that Weight Watchers, one of the most successful diet programs, asks participants to track what they eat.)"
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