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For many, nighttime is the right time to overeat

When is the absolute worst time to overeat, metabolically speaking? Many experts agree that it's nighttime, when our bodies have the lowest need for calories.

Yet "in America, we eat more during dinner than any other meal," says U.S. Department of Agriculture researcher Shanthy Bowman, PhD.

This is especially true for those of us who are overweight, according to a recent national USDA survey. It found that overweight adults tended to eat significantly more calories than normal-weight adults at dinnertime (while eating just a few more calories at breakfast and lunch).

Dinner isn't the only problem, either. While afternoon is the most popular time to snack, evening snacks are in the No. 2 position. According to a recent study from the University of Texas at El Paso, snacking at night makes it all too easy to overeat. That's because eating late in the day may be less satisfying than eating the same amount of food earlier in the day.

"Intake in the late night lacks satiating value and can result in greater overall daily intake" of calories, says the study's lead researcher, John de Castro, PhD, chairman of the psychology department at the University of Texas at El Paso.

Facts About Evening Eating

Over the years, De Castro's research into meal sizes, meal patterns, and calorie distribution has turned up some other findings about evening eating:

  • Meal size tends to increase over the day, with peaks at lunch and dinner. One study showed that participants ate 42% of their total daily calories during and after dinner.
  • Our evening food intake tends to be relatively high in fat, compared to that at earlier meals.
  • The longer the gap between dinner and the previous meal or snack, the larger the dinner. Interestingly, the gap between meals is a significant predictor of meal size for dinner only.
  • People who eat lightly at night end up eating fewer calories and grams of fat overall than people who eat big dinners and nighttime snacks. According to the results of one study, people who had a light snack at night ate 9.3% fewer total calories and 10% less fat overall than those who ate larger nighttime snacks.

Obesity expert Edward Saltzman, MD, thinks the real problem is not so much that we burn fewer calories at night, but that nighttime eating tends to result from unhealthy meal patterns. The three types of meal-pattern problems Saltzman sees most often are:

  • People don't eat during the day and then become ravenous and overeat at night. "If people wonder why they aren't hungry in the morning, it could be because they ate too much the night before," explains Saltzman, an energy metabolism scientist with the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University.
  • Food is used for all sorts of emotional reasons at the end of a workday (as a relaxant, as entertainment, as a distraction, etc.)
  • Eating becomes associated with sedentary behavior, like watching television. In other words, we get into a pattern of eating while we watch TV or use a computer -- activities many of us tend to do in the evening.

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