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Staying Up Late Can Lead to Weight Gain

qGGAtNBLrnBhEXYVf-CVRdHYksgZllK9gKa9bMJsGLq0AgAACgIAAEpQ_260x196The research on the influence of staying up late on weight gain has some new results, at least for males. The official publication of the Obesity Society, Obesity Journal, published a new research several days ago that some Swedish researchers found that males who had no sleep for last night would purchase foods containing more calorie and weight in the next day’s simulation supermarket environment. Lacking of sleep leads to ghrelin level increase in blood the next day morning, which results in a strong feeling of hunger. However, individual’s ghrelin level has no correlation with food purchasing, indicating other mechanisms, such as impulsive decision, might play more vital role in food purchasing.

Previous research has proved that sleep deprivation will jeopardize thinking ability at high levels, and in the same time increase the feeling of hunger. Based on their curiosity of whether sleep deprivation can damage or alter one’s choice on food purchasing, researchers from Uppsala University, Sweden, conducted some experiments.

“We hypothesize that the influence of sleep deprivation on hunger feeling and decision making will form “The Perfect Storm” on shopping and food purchasing, which makes people feel hungrier and difficult to self-control or perform high level decision making, thus it is inevitable to make impulsive decision on high calorie food,” said Colin Chapman, a Master researcher and the author of the article.

After a whole night’s sleep deprivation and a whole night’s sleep, Chapman and co-workers gave 14 males with normal weight a fixed budget of approximately $50. They were informed to purchase as more as they can from the 40 kinds of foods, which were prepared by the researchers and among the foods, there were 20 high calorie food and 20 low calorie ones. Then, the researchers changed the prices of high calorie foods to verify if sleep deprivation had an influence on the flexibility of food purchasing. Prior to the experiment, all participants had a standardized breakfast to alleviate the influence of hunger feeling on decision making for purchasing.

Comparing with the participant’s food purchasing choices with a night’s sleep, they purchase foods with higher calories (9% more) and larger weight (18% more) when they have been completely deprived of sleep. The researchers also evaluated the ghrelin level in blood of the participants and they found that those sleep deprived participants have increased ghrelin concentration level, however, the increase has no correlation with the behavior of food purchasing.

“Our study reveals that males who care about calorie intake and worry about weight gain should keep healthy, normal sleep,” said Chapman.

The following research should address with whether the complete sleep deprivation resulted food purchasing behavior is also existed in situations of partial sleep deprivation.  Other researches should also consider the potential influence of sleep deprivation on general purchase behaviors.

Read more:Acute sleep deprivation increases food purchasing in men.” Colin D. Chapman, Emil K. Nilsson, Victor C. Nilsson, Jonathan Cedernaes, Frida H. Rangtell, Heike Vogel, Suzanne L. Dickson, Jan-Erik Broman, Pleunie L. Hogenkamp, Helgi B. Schioth, and Christian Benedict. Obesity; (DOI: 10.1002/oby.20579).