Night owls may be more likely to have lifestyle missteps Malin added that morning chronotypes “are generally better at activities about five hours from waking, compared with evening chronotypes might need closer to 10–12 hours.” This, he said, is referred to as circadian entrainment.ĭr. He suggested that it could “relate to some extent on matching up the internal clock of the body with the clock society functions off of each day.“ “I think most would say It’s generally more a range from a practical perspective, e.g., could be morning hours, mid-morning to early afternoon, late afternoon to early evening,” said Dr. Steven Malin, associate professor of metabolism and endocrinology at Rutgers University. One’s chronotype is also likely to be individualized, said Dr. “It is possible that life course circumstances or types of work serve as a common cause for both chronotype and lifestyle,” said Dr. Lin added that if the student’s circumstances change, they may shift to a morning chronotype later. Simultaneously, they might also experience increased stress and feelings of being semi-depressed, have trouble sleeping, and adopt a bad lifestyle.”ĭr. “For example, students experiencing heavy workloads might report an evening chronotype because they tend to work and are more alert at night. Kehuan Lin, who wrote the editorial accompanying the study, asked rhetorically: “Is chronotype a causal risk factor, or does it simply reflect the clustering of lifestyle and other factors?” How does chronotype affect lifestyle and disease risks?ĭr. The study and an accompanying editorial are published in the Annals of Internal Medicine. This suggests that these factors, as opposed to an evening chronotype itself, may have much to do with the higher incidence of diabetes. The researchers also considered an intermediate chronotype for people not strongly associating with the other chronotypes.Įvening chronotype people were 54% more likely to have unhealthy lifestyle habits, including smoking, inadequate sleep duration, higher weight and BMI, lack of physical activity, and poorer-quality diet.īefore factoring for socioeconomic factors, shift work, family history of diabetes, and several of these lifestyle habits - especially high BMI and low physical activity levels - the risk of diabetes for people with an evening chronotype was much higher at 72%. Of the participants, 11% described themselves as having a “definite evening” chronotype, while 35% said they had a “definite morning” chronotype. None had a history of cancer, cardiovascular disease, or diabetes at the study’s outset. Each participant filled out a questionnaire every two years from 2009 until 2017. The study involved 63,676 nurses from the ages of 45 to 62. So-called “morning people” have a morning chronotype, while people who prefer the evening and night hours have an “evening” chronotype. The research focuses on chronotypes-the time of day one gravitates toward. The study found that people who go to bed late and get up late are 19% more likely to develop type 2 diabetes than early birds after considering all sociodemographic and lifestyle factors. Being a “night owl” is associated with a greater incidence of type 2 diabetes, according to a new study from Brigham and Women’s Hospital in Massachusetts.
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