Exercise attenuates the metabolic effects of dim light at night

Mice exposed to dim nights (dLAN) increased weight gain, while access to a running wheel prevented this effect.

• Dim nighttime light exposure is associated with increased weight gain in mice.
• Voluntary exercise through a running wheel may buffer against weight gain induced by dim light at night.
• Increased voluntary exercise did not reduce higher daytime food intake caused by dim light.
• Nearly half of the mice exposed to dim light did not show a consistent 24-hour pattern in wheel running.
• Voluntary exercise appears to limit weight gain without correcting circadian rhythm disruptions.

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