New research from Uppsala University shows that a specific brain region that contributes to a person’s appetite sensation is more activated in response to food images after one night of sleep loss than after one night of normal sleep. Poor sleep habits can therefore affect people’s risk of becoming overweight in the long run. The findings are published in The Journal of Clinical Endocrinology & Metabolism.
Researchers Christian Benedict and Helgi Schiöth, of the Department of Neuroscience at Uppsala University, showed in an earlier article, published in American Journal of Clinical Nutrition, that a single night of total sleep loss in young normal weight men curbed the energy expenditure the next morning. This research also showed that subjects had increased levels of hunger, which indicates that an acute lack of sleep may affect human’s food perception.
In a new study, Christian Benedict, together with Samantha Brooks, Helgi Schiöth and Elna-Marie Larsson from Uppsala University and researchers from other European universities, have now systematically examined which regions in the brain, involved in appetite sensation, are influenced by acute sleep loss. By means of magnetic imaging (fMRI) the researchers studied the brains of 12 normal-weight males while they viewed images of foods. The researchers compared the results after a night with normal sleep with those obtained after one night without sleep.
Christian Benedict explains:
“After a night of total sleep loss, these males showed a high level of activation in an area of the brain that is involved in a desire to eat. Bearing in mind that insufficient sleep is a growing problem in modern society, our results may explain why poor sleep habits can affect people’s risk to gain weight in the long run. It may therefore be important to sleep about eight hours every night to maintain a stable and healthy body weight.”
A new study, published in the Journal of Marriage and Family reveals that married couples experience few advantages for psychological well-being, health, or social ties compared to unmarried couples who live together. While both marriage and cohabitation provide benefits over being single, these reduce over time following a honeymoon period.
“Marriage has long been an important social institution, but in recent decades western societies have experienced increases in cohabitation, before or instead of marriage, and increases in children born outside of marriage,” said Dr Kelly Musick, Associate Professor of policy analysis and management at Cornell University’s College of Human Ecology. “These changes have blurred the boundaries of marriage, leading to questions about what difference marriage makes in comparison to alternatives.”
Previous research has sought to prove a link between marriage and well-being, but many studies compared marriage to being single, or compared marriages and cohabitations at a single point in time. This study compares marriage to cohabitation while using a fixed-effects approach that focuses on what changes when single men and women move into marriage or cohabitation and the extent to which any effects of marriage and cohabitation persist over time. [continue reading…]
Millions of human interactions were assessed during the study which included actions such as communication, founding and ending friendships, trading goods, sleeping, moving, however also starting hostilities, attacks and punishment. The game does not suggest any rules and everyone can live with their avatar (i.e. with their “game character” in the virtual world) as they choose. “And the result of this is not anarchy”, says Thurner. “The participants organise themselves as a social group with good intents. Almost all the actions are positive.”
“Exactly how people tick”
The interactions were fed into an “alphabet” by the researchers, “similar to how the genetic code of DNA was decoded 15 years ago”, says Thurner. “From this we get a pattern which reflects how people tick”. However, there is quite a high potential for aggression: so, for example, if a negative action is inflicted, the probability that the player will subsequently also act aggressively shoots up more than tenfold, even to about 30 percent. [continue reading…]
