Night owls have higher risk of diabetes

A new study has found that night owls, regardless of other lifestyle factors, may have a higher risk of diabetes or reduced muscle mass compared to early risers.

The findings, published in The Journal of Clinical Endocrinology and Metabolism, looked at the sleeping habits of 1,620 middle-aged adults. The participants, ranging in age from age 47 to 59, were asked to identify themselves as strong morning people, strong night people, or somewhere in-between.  Additional questions looked at how easy it was for them to get moving in the morning, how alert they felt, what time they usually go to bed, and sleeping preferences for different situations.

The research subjects were also asked to undergo several tests including the oral glucose tolerance test for diabetes, body composition measurement (to determine muscle loss), and the visceral obesity diagnosis test by measurement of abdominal computed tomography (CT).  Researchers then analyzed the morning or night responses, or so-called "chronotypes" to determine whether there was a link with metabolic disorders including diabetes, metabolic syndrome, sarcopenia (reduced muscle mass) and obesity.

They found that to be the case, that the night owl chronotype was associated with diabetes, metabolic syndrome, and reduced muscle mass.  The findings also revealed sex and age elements,  such as that female night owls tended to have more abdominal fat and a higher risk of metabolic syndrome, while male night owls were more likely to have diabetes or sarcopenia. All night owls, regardless of gender, tended to be younger and have higher body fat and blood triglyceride levels than morning people.

The study controlled for potential lifestyle factors, such as age, gender, body mass index, smoking, alcohol consumption, sleep duration, and use of medications.

Researchers suggested that the findings could be caused by night owls’ tendency to have poorer sleep quality and unhealthier habits such as late-night snacking or a more sedentary lifestyle.

The results highlight the importance of research on circadian rhythms and provide more information that could be helpful for preventing diabetes and reduced muscle mass.

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[Sourced from: Medical News Today , http://www.medicalnewstoday.com/articles/291829.php](Metabolic problems 'more likely in evening types than morning people')