I just read that “women who live in cities that are brightly lit at night are 73 percent more likely to get breast cancer than those in the darkest areas, a recent study in Israel found” (in AARP Oct. 2008).
“The new study is one of a growing number of studies that have suggested that nighttime light is disruptive to the body, though researchers are still trying to understand the underlying mechanisms.” http://cityroom.blogs.nytimes.com/2008/02/25/bright-lights-at-night-perhaps-not-such-a-delight/?pagemode=print
“People who are working while others are stargazing may face the greatest risks. Hormonal disturbances triggered by nighttime exposure to white or bluish light can disrupt circadian rhythms and fuel the growth of tumors, experiments show. Two decades of research indicate that women who work night shifts have unusually high rates of breast cancer, and some data suggest a parallel effect on male workers’ prostate cancer rates. Last December, a unit of the World Health Organization deemed shift work a probable human carcinogen.
“Yet light and cancer may be even more fundamentally linked. In last month’s study, a team that included Richard Stevens, the University of Connecticut Health Center epidemiologist who first proposed the connection, compared satellite images of Israel at night with maps showing where cancers are most common. Its analysis suggests that 73 percent more breast cancers occur in the country’s brightest communities than in its darkest.”