Sunday, October 17, 2010

Sleep more & Stay Slim or sleep less & live longer

This is a dilemma. Do I want to sleep less, live longer and be fat? Or do I sleep more, stay slim and die young? These studies are keeping me awake at night that I am living the first one by default. But then, there is another study that says that plenty of sleep keeps your sex drive alive. So, it boils down to getting lots of sleep, to stay slim and horny but live a short life. Or sleep less, become fat and have no sex drive and live long. WHAT A CHOICE!

Sleep in to keep trim: study 
By Jessica Murphy, QMI Agency
Last Updated: October 5, 2010 2:55am

MONTREAL - It seems one of the best things you can do to keep trim is sleep in, a new U.S. study says University of Chicago researchers have found cutting back on sleep reduces the benefits of dieting by limiting overall fat loss and supersizing hunger.
"If your goal is to lose fat, skipping sleep is like poking sticks in your bicycle wheels," said lead researcher Plamen Penev.
The small-scale study, published in the latest issue of the Annals of Internal Medicine, followed 10 overweight or obese volunteers between 35 and 49. Each person was placed on a balanced diet that restricted calories to 90% of what they needed to maintain their weight without exercise.
Each participant spent two weeks under observation getting 8.5 hours of sleep a night and another two weeks with just 5.5 hours a night.
Volunteers lost an average of 6.6 lbs. at each session. But when researchers dug deeper, they found sleep-deprived volunteers lost just 1.3 lbs. of fat compared to 5.3 lbs. of lean body mass, which includes muscle.
When volunteers got more sleep, fat loss and lean body mass loss was roughly equal.
Sleep-deprived participants also had higher levels of ghrelin, a hormone that boosts hunger levels and promotes fat retention.
It may explain why previous studies indicated sleep-deprived people ate more. A study published in June in the American Journal of Clinical Nutrition found one night of reduced sleep led study participants to eat 20% more calories the next day.
Penev's subjects, who were closely watched in a lab setting, had no choice but to follow their diet.
"They couldn't follow their feelings of hunger," he said. "The diets they were given, in the real world they would also be the ones responsible for following the meal plan, which would make it harder to stick to that plan."
And by losing lean body mass, they further undermined any fat-loss efforts by slowing their metabolism.
"As they're investing all this effort into losing the excess fat, they're also setting themselves up to having to keep cutting and reducing the amount of calories they're eating in order to be successful," Penev explained.
He said the next step is more research in a real-world setting like medical centres with weight-loss programs, where participants can be tracked for longer periods.
But the study's findings may be enough to convince dieters to cut calories, not catnaps.
"It suggests the amount of sleep one gets during periods of dieting could make a significant difference," Penev said.
Sleeping problems affect one in four Canadians, according to the Ontario health ministry, which recommends six to nine hours a day for people 16 to 65
.

Only sleeping five hours a night? You may live longer than your friends.

A study done at the University of California, San Diego has found that sleeping between five and six-and-a-half hours a night is associated with the greatest longevity, at least in women over 50.
This may be great news for women who aren’t getting as much sleep as they used to, and are worried about it.

A team of scientists did a two-part study. The first stage took place between 1995 and 1999. They monitored the sleeping habits of 459 women between the ages of 50 and 81 living in California. Then, 14 years later, the scientists returned to study the same group. Eighty-six of the women had died; 444 of the original women were located and evaluated.

The researchers were surprised to find that the best survival was in women who slept between five and 6.5 hours a night. Women who slept less than five hours a night or more than 6.5 hours were less likely to be alive at the end of the 14 years.
“This means that women who sleep as little as five to six-and-a-half hours have nothing to worry about since that amount of sleep is evidently consistent with excellent survival,” reported lead author Dr. Daniel Kripke, professor emeritus of psychiatry at UC San Diego school of medicine. The study was published online in the journal Sleep Medicine

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