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Late bedtime, less sleep causes weight gain

In the largest, most diverse healthy sample studied to date under controlled laboratory conditions, results show that sleep-restricted subjects who spent only four hours in bed from 4 am to 8 am for five consecutive nights gained more weight than control subjects who were in bed for 10 hours each night from 10 pm to 8 am.

The study found an overall increase in caloric intake during sleep restriction, which was due to an increase in the number of meals consumed during the late-night period of additional wakefulness.

Furthermore, the proportion of calories consumed from fat was higher during late-night hours than at other times of day.

"Although previous epidemiological studies have suggested an association between short sleep duration and weight gain/obesity, we were surprised to observe significant weight gain during an in-laboratory study," lead author Andrea Spaeth, a doctoral candidate in the psychology department at the University of Pennsylvania in Philadelphia, said.

(Agencies)

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