A night light can lead to excess weight. Free Technical Library News

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Night light can lead to excess weight

05.12.2022

Turning on the lights at night can affect your meal schedule and add a few inches to your waistline.

According to Ohio State University researcher Laura Fonken, mice that were exposed to low light at night gained 50 percent more weight over an eight-week period than mice that spent their nights in complete darkness.

"In many ways, our society is now running on a 24-hour schedule," Fonken said. These results suggest that such a schedule may affect metabolic function, leading to weight gain.

Hormones that help metabolism affect people exposed to light at night, Fonken said. Night light could reduce the amount of these hormones in mice, and together with a malfunction in the internal clock of mice, could cause them to gain weight.

Mice are nocturnal, so they usually eat at night. But mice living in dim conditions ate 55 percent of their food during the day, compared to mice in standard light-dark conditions, which ate 36 percent of their food during the day. This is evidence that their internal eating schedule has been disrupted due to the change in light, the researchers say.

Mice that were exposed to light at night showed altered feeding behavior, eating more during the resting phase, which may be responsible for the weight gain.

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