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From VOA Learning English, this is the Health Report.
A new study in Korea found that “night owls,” people who stay up late, face a greater risk of developing diabetes than “larks,” people who wake up early. Researchers said this was true even when they slept the same number of hours. The study found that people who go to bed well after midnight develop more health problems than people who go to bed early. Orfeu Buxton studies the human brain and nervous system in the Division of Sleep Medicine at Harvard Medical School. Mr. Buxton was not involved in the Korean study. But he says that the relationship between sleep and disease has to do with the human body clock. He says the body prepares for activities linked to time of day. He says humans shut down as night comes on so eating at that time can have unwanted results, like weight gain around the body’s middle.
The Korean researchers compared the health habits and metabolism of about 1,600 people, ages 47 to 59. The group was divided by their so-called chronotype or sleep-wake cycle. The night owls were found to have higher levels of body fat and fats in their blood. They also had more muscle wasting than the larks. Mr. Buxton says people whose jobs start later in the day are more likely to show the signs of increased risk for diabetes. He says the night owls generally had unhealthier lifestyles. This includes smoking, exercising less and eating later. Mr. Buxton published his study in the Journal of Clinical Endocrinology & Metabolism.