Sleeping is Good for Weight Control

Public release date: 8-Jun-2009
http://www.eurekalert.org/pub_releases/2009-06/aaos-srr060209.php

Sleep restriction results in weight gain despite decreases in appetite
and consumption

WESTCHESTER, Ill. – According to a research abstract that will be
presented on Monday, June 8 at SLEEP 2009, the 23rd Annual Meeting of
the Associated Professional Sleep Societies, in the presence of free
access to food, sleep restricted subjects reported decrease in appetite,
food cravings and food consumption; however, they gained weight over the
course of the study. Thus, the finding suggests that energy intake
exceeded energy expenditure during the sleep restriction

Results indicate that people whose sleep was restricted experienced an
average weight gain of 1.31 kilograms over the 11 days of the study. Of
the subjects with restricted sleep who reported a change in their
appetite and food consumption, more than 70 percent said that it
decreased by day 5 of the study. A group of well rested control subjects
did not experience the weight gain.

According to lead investigator Siobhan Banks, PhD, a research fellow at
the University of South Australia and former assistant research
professor at the University of Pennsylvania School of Medicine, it was
surprising that participants did not crave foods rich in carbohydrates
after sleep restriction, as previous research suggested they might.
Results indicate that even though physiologically the desire to eat was
not increased by sleep loss in participants, other factors such as the
sedentary environment of the laboratory and the ability to snack for
longer due to reduction in time spent asleep might have influenced the
weight gain.

"During real-world periods of sleep restriction (say during shift work),
people should plan their calorie intake over the time they will be
awake, eating small, healthy meals," said Banks. "Additionally, healthy
low fat/sugar snacks should be available so the temptation to eat
comfort foods is reduced. Finally, keeping up regular exercise is just
as important as what food you eat, so even though people may feel tried,
exercising will help regulate energy intake balance."

The study involved 92 healthy individuals (52 male) between the ages of
22 and 45 years who participated in laboratory controlled sleep
restriction. Subjects underwent two nights of baseline sleep (10 hours
in bed per night), five nights of sleep restriction and varying recovery
for four nights. Nine well rested participants served as controls. Food
consumption was ad libitum (subjects had three regular meals per day and
access to healthy snacks, and during nights of sleep restriction
subjects were given a small sandwich at one a.m.).