Working nights may raise risk for diabetes

Night-shift work is linked to an increased risk for Type 2 diabetes, a new study has found.

British researchers used a large health database to compare diabetes prevalence in 47,286 night-shift workers with that of 224,928 day workers.

The database included information on age, sex, race, family history of diabetes, alcohol use, sleep duration, body mass index and other health and behavioral characteristics, as well as diagnoses of diabetes.

After controlling for many other factors associated with diabetes, they found that the more often people worked nights, the more likely they were to have diabetes. Compared with day workers, people who occasionally worked night shifts were 15 percent more likely to have diabetes; those who rotated shifts with some night work were 18 percent more likely; and those who worked irregular shifts with frequent night shifts were 44 percent more likely to have Type 2 diabetes. The study is in Diabetes Care.

study is in Diabetes Care

The lead author, Céline Vetter, an associate professor at the University of Colorado, said that night-shift work can cause misalignment of circadian rhythms, reduced energy expenditure, and partial sleep restriction, which can all contribute to the risk.

“We appreciate that in some industries — health care, safety — we


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