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Cesar

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People who consistently get too little sleep face bigger concerns than daytime fatigue and crankiness. Over the long term, sleep deprivation also increases the risk of serious health problems including obesity and type II diabetes.Scientists have come up with a number of plausible explanations for this increased risk. Various studies have shown, for instance, that how much we sleep can affect blood sugar levels, hormones that control appetite, and even the brain's perception of high-calorie foods.A small new study, published Monday in the Annals of Internal Medicine, adds a key piece to the puzzle by drilling down to the cellular level: Sleep deprivation, the study found, impairs the ability of fat cells to respond to insulin, a hormone that regulates metabolism and is involved in diabetes.In the study, seven healthy young men and women spent a total of eight days and nights in a sleep lab. They were allowed to sleep normally on four of the nights, and on the other nights they were limited to just 4.5 hours. In order to neutralize the effects of appetite or overeating, the researchers strictly controlled the participants' meals and calorie intake.
After the four nights of sleep deprivation, blood tests revealed that the participants' overall insulin sensitivity was 16% lower, on average, than after the nights of normal sleep. Moreover, their fat cells' sensitivity to insulin dropped by 30%, to levels typically seen in people who are obese or who have diabetes."This is the equivalent of metabolically aging someone 10 to 20 years just from four nights of partial sleep restriction," says Matthew Brady, the senior author of the study and an associate professor of medicine at the University of Chicago. "Fat cells need sleep, and when they don't get enough sleep, they become metabolically groggy."Specifically, the participants' fat cells -- which were collected via biopsy

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