Exposure to artificial light at night may significantly increase the risk of developing type 2 diabetes, according to a new large-scale study. Researchers at Monash University in Australia followed nearly 85,000 people aged 40 to 69 for nine years, using wrist-worn devices to track their light exposure.
The study found a strong correlation between nighttime light exposure and the development of type 2 diabetes. Participants in the top 10% for nighttime light exposure had a 67% higher risk of developing the disease compared to those with the least exposure. This association held even after accounting for factors like sleep duration and overall health habits.
While the study doesn’t establish causation, it suggests that artificial light disrupts the body’s natural sleep-wake cycle, potentially leading to metabolic issues. This disruption may be caused by blue light from smartphones and TVs, but even yellow light from reading lamps can have an impact.
“Avoiding night lights is a simple and cost-effective recommendation that may help reduce the global burden of type 2 diabetes,” said the study’s lead author.
The research adds to growing evidence linking nighttime light exposure to health problems. However, the study had limitations. It did not account for meal timings, which can affect blood sugar levels, and considered socioeconomic factors only regionally. Individual sensitivity to light also varies.
Future studies are needed to solidify the connection between nighttime light and diabetes. These findings suggest that limiting screen time before bed and maintaining a dark sleep environment may be beneficial for overall health.
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