Daylight at work may steady glucose in type 2 diabetes, small controlled trial suggests
Latest news on WhatsApp أجدد الأخبار على واتسابA short-controlled trial suggests that bringing natural daylight into typical work hours may be linked to steadier glucose control for people with type 2 diabetes, compared with constant artificial indoor lighting, alongside signals of a shift in whole-body fuel use.
Published in Cell Metabolism, the randomized crossover study followed 13 older adults with type 2 diabetes in a controlled “living-room” environment for 4.5 days under each lighting condition. During the daylight condition, continuous glucose monitoring showed more time in the normal range with lower variability, with markers consistent with greater fat oxidation and slightly higher evening melatonin signals.
The findings align with broader population evidence that the timing of light exposure matters. A UK Biobank analysis based on light-sensor data reported higher incident type 2 diabetes risk among people exposed to brighter light at night and patterns likely to disrupt circadian rhythms.
Long-term claims, including cancer-related concerns, generally come from wider evidence on chronic circadian disruption rather than any single short experiment. IARC classifies night shift work as “probably carcinogenic to humans” (Group 2A), reflecting concern about sustained disruption of biological timing.
For body weight, a large cohort study of women found that sleeping with a light or TV on was associated with higher odds of weight gain and obesity over time, though the study design cannot prove cause and effect.
