Patienty: Exposure to blue light at night increases the risk of colorectal cancer.

Blue light has become an increasingly common part of urban outdoor lighting.
How does it affect our health? A team led by the Barcelona-based Institute for Global Health (ISGlobal), supported by the la Caixa Foundation, conducted the first study of the relationship between night-time exposure to outdoor artificial light and colorectal cancer.
published in Epidemiology: Exposure to blue light may increase the risk of colorectal cancer.
previous studies have found a link between night-time exposure to artificial light, especially blue light, and various adverse health effects, including sleep disorders, obesity and increased risk of various cancers, especially night shift workers.
Blue Light is a range of visible light emitted by most white LEDs and many tablet and phone screens. an earlier study
ISGlobal found a link between nighttime exposure to blue light and an increased risk of breast and prostate cancer.
colorectal cancer is the third most common cancer in the world for lung and breast cancer.
currently listnight work as a potentially carcinogenic work by the WHO's International Agency for Research on Cancer (IARC), who have the highest risk of breast cancer, prostate and colorectal cancer.
, the researchers used the same research methodas as before to analyze the relationship between artificial light exposure and colorectal cancer risk.
researchers analyzed data from about 2,000 adults in Barcelona and Madrid, 660 of whom had colorectal cancer, and the rest were randomly selected from the local population.
have a history of night work and are excluded.
levels of artificial light outdoors at night are determined by images from the International Space Station (ISS).
analysis showed that people exposed to blue light had a 60 percent higher risk of colorectal cancer than those exposed to blue light.
no association between full-spectral light and colorectal cancer has been found.
researchers point out that nighttime exposure to light, especially blue light, reduces the production and secretion of melatonin, depending on the intensity and wavelength of the light.
because exposure is estimated by satellite imagery, this analysis does not take into account individual behavior, such as the use of mobile blinds.
and blinds are common in Spain and other Mediterranean countries.
therefore, estimates of exposure can be interpreted as the amount of light people come into contact indoors before they go to bed outdoors (a common pattern in Spain).
researchers concluded by commenting that there was growing concern about the effects of light on ecosystems and human health.
research on the potential effects of exposure to light is still in its infancy, more needs to be done to provide reliable, evidence-based recommendations to prevent adverse consequences.
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