Women who work the night shift may have a 40-percent higher risk of breast cancer than daytime workers, a new study from the Danish Cancer Society suggests. But your risk appears lower if you?re naturally a night owl.
The researchers found that the more night shifts you work, the higher your risk, TIME reported May 29.
Exposure to artificial light at night ? the kind you?re likely to experience staying awake on the night shift ? suppresses the body?s melatonin levels and may cause other hormonal imbalances as well that could influence breast-cancer risk, the study authors speculate. Breast-cancer patients usually have lower levels of melatonin, research shows.
People who are predisposed to being early risers fare worse than women who are more comfortable being awake into the odd hours of the morning, the researchers find. ?Morning? types who pull night shifts have a four times higher risk of breast cancer than women who work during the day, the study says.
?It?s much worse to be a morning person and have night shift work when it comes to breast cancer,? study co-author Johnni Hansen, Ph.D., says.
The study appears online in the journal Occupational and Environmental Medicine.
(Photo ? tomislavmedak via Flickr)
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