According to a study in The New England Journal of Medicine, people who jotted down what they ate realized that they had been underestimating their daily intake by about 1,050 calories. No, that is not a typo. Added to your daily menu, 1,050 calories will put on an extra pound every three and a half days.
Researchers at the Center for Behavioral Medicine in Chicago found that when overweight people were asked to keep food diaries for ten weeks, the most diligent recorders lost more weight than the lax ones. The study, published in Health Psychology, showed that subjects gained about 500 percent more weight per week than usual over the Thanksgiving, Christmas, and New Year's holidays—with the exception of those who were consistent food diarists. As this group entered the dangerous season to be jolly, they began keeping notes even more faithfully than before, and instead of gaining weight, they actually lost, on average, about ten pounds more than the others.
Even if you have a hard time keeping track of details and can't imagine recording every bite for the rest of your eating life, doing so for a short time could give you a jumpstart on weight loss. A study in Obesity Research showed that regardless of how carefully subjects kept their food diaries, they dropped much more weight during their two most consistent weeks of note-taking than their least.
You decide how much information to include in your daily confessional. The process can be as simple as writing down the type of food you eat and how much. (But the abridged version, "burger for lunch," doesn't cut it if you've actually devoured a quarter-pounder with cheese, mayo, and ketchup on a bun, shared a bag of chips with your friend, and had several sips of his chocolate milk shake.) You may also find it helpful to keep a tally of calorie counts, especially if you try a diary and it doesn't seem to help with weight loss. Other data to consider recording: (1) the time you ate, (2) what was going on, (3) who you were with, and (4) how you felt afterward. This information can help you see when and why you eat, and then to break destructive patterns. Some people also log their daily weight and the exercise they get.
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