Chinese scientists have issued a warning against exposure to artificial lights at night, citing a study that links such exposure to an increased risk of stroke. The study, conducted in the city of Ningbo, China, followed over 28,000 adults over a six-year period, with 1,278 participants developing cerebrovascular diseases, including strokes.
The researchers found that individuals with higher levels of exposure to night light had a 43% greater risk of developing cerebrovascular diseases. Additionally, those exposed to high levels of pollution from petrol, oil, diesel, or wood combustion had a 41% higher risk of suffering from such diseases.
The study suggests that artificial light sources like LED and fluorescent lamps can disrupt melatonin production, a hormone essential for regulating the body’s sleep patterns. Chronic sleep disturbances, in turn, increase the risk of poor cardiovascular health.
Lead researcher Jian-Bing Wang emphasized the need for policies and prevention strategies to address the impact of environmental factors like light and air pollution on public health, particularly in densely populated and polluted areas. However, Wang also acknowledged limitations in the study, such as the lack of data on participants’ indoor lighting tools and window treatments.
The findings highlight the importance of considering environmental factors in efforts to reduce the global burden of cardiovascular disease. As such, reducing exposure to artificial lights at night and addressing pollution sources could be crucial steps in protecting public health.