Losing weight in your sleep is a dream that many overweight people have had!
So, whatís behind this idea thatís been discussed in length online?
There are studies on the subject, such as a study at the American National Institute of Mental Health in Bethesda and the in psycho-Social Medicine Department at the University of Zurich (Sleep, 27, 2004, 661).
The scientists who worked on this study proved that people who donít sleep that much tend to be fatter than those who sleep normally. 496 adults between 27 and 40 were observed for 13 years. During this time the average time they slept fell: from 7.7 to 7.3 hours per night for women and from 7.1 to 6.9 hours per night for men. At the same time test subjects Body Mass Index (BMI) got worse.
The scientists offered the following explanation: the longer you sleep, the less time you have to eat. But, thereís also another reason, that during sleep hormones like leptin are released, which control the appetite, according to Dr. Sanjay R. Patel in his article about the study.
Those interested in the subject of losing weight while we sleep also argue that the body has its own biorhythm, like plants that open their petals in the morning. So, losing weight while you sleep should work as the fat burning process increases at night.
In a press release on October 4 2010, the University of Chicago Medical Center released a press release titled Sleep Loss Limits Fat Loss.
"Lack of sufficient sleep may compromise the efficacy of typical dietary interventions for weight loss and related metabolic risk reduction,Ē the study authors concluded in an article released Monday in the Annals of Internal Medicine, a journal of the American College of Physicians.
Test subjects lost the same amount of weight, whether they slept for a full night or less. But, when they got enough sleep, more than half of the weight they lost was in body fat. If they didnít sleep enough, only a fourth of the weight they lost was fat. They also felt hungrier, as lack of sleep means that higher levels of the hormone ghrelin were produced and this leads to feelings f hunger and also means that less fat is burned as energy.
"If your goal is to lose fat, skipping sleep is like poking sticks in your bicycle wheels," said study director Plamen Penev, MD, PhD, assistant professor of medicine at the University of Chicago. "Cutting back on sleep, a behavior that is ubiquitous in modern society appears to compromise efforts to lose fat through dieting. In our study it reduced fat loss by 55 percent."
10 healthy, overweight people between 35 and 49 took part in the study. They each got an individual menu plan. Each person was studied for two 14 day periods in the lab at the Chicago University Medical Center, where they slept for an average of 7 hours for the first period and then for 5 hours 14 minutes for the second. During the day they went about their daily routines as usual. They ate 1450 kcal every day.
During a 14 day session they each lost an average of 6.6 pounds. During the 7 hour a night sleep period they lost 3.1 pounds of body fat and 3.3 pounds of other substances, mostly protein. When they had less sleep they lost an average of 1.3 pounds of fat and 5.3 pounds other bodily substances.
Peney said. "For the first time, we have evidence that the amount of sleep makes a big difference on the results of dietary interventions. One should not ignore the way they sleep when going on a diet. Obtaining adequate sleep may enhance the beneficial effects of a diet. Not getting enough sleep could defeat the desired effects."
The National Institutes of Health funded this study. Additional researchers include Dale Schoeller, PhD, of the University of Wisconsin, Madison, WI; plus Jennifer Kilkus, MS, and Jacqueline Imperial, RN, of the University of Chicago's General Clinical Resource Center; and Arlet Nedeltcheva, MD, at the University of Chicago at the time of the study but now at the U.S. Food and Drug Administration.
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