The role of daylight exposure on body mass in male mice

Mice exposed to bright daytime light (≥125 lux) gained significantly less weight than those under dim light conditions (≤60 lux).

• Exposure to bright days with dark nights resulted in lower weight gain compared to bright days with dim nights or dim days.
• Dim light during the day may have metabolic effects similar to those of nighttime artificial light exposure.
• No weight gain differences were found between dark nights and dim light at night among mice exposed to dim daytime light.
• Dim light at night shifted food intake to the inactive phase, consistent with previous findings.

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