The July 24 issue of Molecular Psychiatry contains an animal study that showed that hamsters exposed to dim light at night for 4 weeks showed signs of depression, changes to their hippocampus found in depression, and an increase in the inflammatory marker tumor necrosis factor (TNF). Previous research has shown an association between dim light at night and breast cancer and obesity. Both of these conditions, along with depression, are associated with an increase in inflammation. The good news here is that the symptoms of depression were reversible when the animals were returned to a normal light-dark cycle.
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