again) what we’ve been telling folks for years: the less sleep you get, the more weight you might gain. Researchers observed a more than 2-point increase in Body Mass Index (BMI) for each hour of lost sleep. That’s roughly a 13 pound increase in weight for a person that starts at a baseline of 150 pounds. The study, published in the October issue of the journal Sleep, followed more than 3,300 youths and adults and recorded the BMI increase over a 5-year period. Interestingly, the study noted that total sleep time, reduced screen time (smart phones, tablets, TV, etc) and even exercise did not mitigate the BMI increase. “These results highlight adolescent bedtimes, not just total sleep time, as a potential target for weight management during the transition to adulthood,” said Lauren Asarnow, lead author of the study and a doctoral student in UC Berkeley’s Golden Bear Sleep and Mood Research Clinic. Surveys show that many teenagers do not get the recommended nine hours sleep a night, and report having trouble staying awake at school. The human circadian rhythm, which regulates physiological and metabolic functions, typically shifts to a later sleep cycle at the onset of puberty. The results of the study thus suggest that adolescents who go to bed earlier will “set their weight on a healthier course as they emerge into adulthood,” Asarnow said. (source: http://news.berkeley.edu/2015/10/01/late-bedtimes-bmi)]]>
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