
A study on diurnal grass rats found that standard fluorescent office lighting weakens circadian rhythms and doubles the incidence of diabetic-range blood glucose compared to daylight conditions. Sperm motility was also cut by more than half in the fluorescent group. However, exposing the animals to just one hour of midday daylight restored their daily rhythms.
The finding suggests that indoor lighting is a biological exposure as significant as diet or exercise, but the results remain preliminary because they were observed in rodents. Researchers acknowledge that more work is needed to confirm these specific metabolic and reproductive effects apply to humans.
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