A report published online this week in the Proceedings of the National Academy of Sciences (http://www.pnas.org/) suggests that some of the increase in obesity observed over the past several decades could be due to increased exposure to light at night and shift work, which disrupts the release of melatonin, a hormone produced by the pineal gland in the brain in response to darkness. "Light at night is an environmental factor that may be contributing to the obesity epidemic in ways that people don't expect," observed study coauthor and Ohio State University professor of neuroscience and psychology Randy Nelson. "Societal obesity is correlated with a number of factors including the extent of light exposure at night." Read more...
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