A weak, but constant lighting at night has an effect on body weight. Those who preferred a night not quite darkened bedroom or even late at the computer is in danger against the body clock to eat, which can much more quickly lead to obesity. Initial animal studies show that after four weeks, the animals were kept in dim light more than half increased in body weight than control animals at 16 hours light and 8 hours Darkness lived. Twilight seems to increase the appetite.
Literature: Laura K. Fonken, Joanna L. et al. Light at Night Increases body mass by shifting the time of food intake PNAS published ahead of print October 11, 2010, doi: 10.1073/pnas.1008734107
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