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Byline: Kristin Sainani
158% higher rates of melanoma occurred in women who had used tanning beds once a month in their 20s compared with those who had not. --Journal of the National Cancer Institute
Longer, Healthier Sleep
Getting adequate sleep could help prevent breast cancer. Among 33,528 Chinese women, those who reported sleeping at least nine hours per night had 42 percent higher levels of the hormone melatonin and were 19 percent less likely to get breast cancer in the next 11 years compared with those who logged six or fewer hours. The link was strongest for long sleepers who were lean and postmenopausal; they had 118 percent more melatonin and 53 percent lower breast-cancer risk than brief sleepers overall. Longer sleep presumably boosts levels of melatonin, which interferes with estrogen receptors and inhibits growth of breast-cancer cells, says Anna H. Wu, professor of preventive medicine at the University of Southern California. Melatonin may be reduced by nighttime light exposure and night-shift work as well as by little sleep.
New Evidence Against Tanning
Along with skin cancer, indoor tanning is commonly believed to cause premature skin aging--and a new study is the first to provide direct proof of this. Eighteen young adults who used tanning beds regularly for three months (and had never done so before) had a 2.6- to 3.6-fold increase in an aging-related mutation in their skin. (Forty-one other volunteers with a ...