January 25, 2014 in Features

Late-night snackers prone to weight gain

Anthony L. Komaroff Universal Uclick

DEAR DOCTOR K: Is it true that eating late makes you gain weight?

DEAR READER: I’d heard the same thing for decades, but I wasn’t sure it was true. I had to do some research to answer your question.

Several recent studies have looked into this question. The results were not unanimous, but most studies show that eating late in the day does contribute to weight gain and other health problems.

In one study, researchers found that eating a big breakfast and a small dinner is better for weight loss than eating a small breakfast and a large dinner.

Ninety-three women with metabolic syndrome participated in this study. (Metabolic syndrome is a set of risk factors that increases your risk for heart disease, stroke, diabetes and other health problems.) The women were randomly assigned to different diets. Group 1 ate a 700-calorie breakfast, 500-calorie lunch and 200-calorie dinner. In contrast, Group 2 ate a 200-calorie breakfast, 500-calorie lunch and 700-calorie dinner.

After 12 weeks, the researchers measured weight loss in both groups. Women in Group 1 lost significantly more weight than women in Group 2. The women in Group 1 also had lower insulin, glucose and lipid levels.

A problem with late-night eating is that most people tend to overeat at that time. We eat out of boredom, or fail to adjust our daytime calories to allow for a nighttime snack. Nighttime snackers are more likely to develop unhealthy eating habits, which can lead to weight gain.

Another factor that may come into play is the body’s circadian rhythm, or sleep-wake cycle. One study suggested that our body processes food differently at different times of day. Another recent study, by researchers at Brigham and Women’s Hospital and Harvard Medical School, found that the body’s circadian rhythm makes us hungrier in the evening.

Whatever the mechanism, eating late at night does appear to contribute to weight gain. If you’re trying to lose weight, put an end to those late-night snacks.

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