Past studies have shown that exposure to artificial light (especially blue light) at night can cause circadian rhythm disturbances and increase the risk of breast and prostate cancer. Recently, a Spanish study published in "Epidemiology" (Epidemiology) analyzed the relationship between blue light exposure and colorectal cancer and found that the two are also significantly related!
Go to bed, turn off the lights, play with your phone. These three actions can be said to be the most basic bedtime rituals of contemporary "community animals".
However, when a message flickers on the screen of the mobile phone, certain diseases may come quietly...
Spanish study: Long-term exposure to blue light at night increases the risk of colorectal cancer!
Mobile phones, computers, and LED lights all emit blue light. Past studies have shown that exposure to artificial light (especially blue light) at night can cause circadian rhythm disorders and increase the risk of breast and prostate cancer. Recently, a Spanish study published in Epidemiology (Epidemiology) analyzed the relationship between blue light exposure and colorectal cancer, and found that the two are also significantly related!
The researchers obtained data on about 2,000 adults in Barcelona and Madrid through the MCC-Spain project, including 660 patients with colorectal cancer, and the others were randomly selected from the local area. Researchers used the International Space Station (ISS) aerial images to determine the level of outdoor artificial light sources in the two cities at night.
It was found that there was a positive correlation between blue light exposure and colorectal cancer. People who have been exposed to blue light for the longest time have a 60% higher risk of colorectal cancer than those who are less exposed.
The cause of this result is considered to be related to "melatonin". Melatonin affects the human circadian rhythm. Exposure to artificial light at night (especially blue light) will reduce the amount of melatonin secreted in the pineal gland of the human brain, which will disrupt the circadian rhythm and induce cancer. As early as 2007, the International Agency for Research on Cancer (IARC) considered "shift work with circadian rhythm disorders" as a carcinogen.
People "talk about blue light discoloration", is blue light really that scary?
In recent years, "blue light" has become a hot topic in medical circles at home and abroad: there are studies on blue light causing cancer, some studies on blue light affecting sleep, and even studies suggesting that blue light can induce obesity... Various "impeachment" of blue light Phenomenon, people "talk about blue light discoloration." Is blue light really that scary?
In fact, blue light is not a "big scourge." There are many color spectrums in nature; blue light is one of them. No matter in nature or in products such as computers and mobile phones, there are traces of blue light. The wavelength of blue light is between 400-500 nanometers. Because the shorter the wavelength, the higher the energy and the stronger the penetrating power, the blue light is the strongest in visible light.
The harmful effects of blue light on the human body exist objectively, such as inducing macular degeneration, disrupting the body's circadian rhythm, and increasing the risk of disease. However, "talking about toxicity aside from dosage is hooliganism"! The damage to blue light to people is related to the intensity and duration of exposure. If a person is fine looking at the strong light all day long, it will be strange if the eyes are "not blind" for a long time! In addition, not all blue light is harmful. What is really harmful is the short-wave blue light between 400-440 nanometers, and the blue light between 450-500 nanometers has a certain role in adjusting biological rhythms, affecting people's mood, sleep, and memory. Wait.
Therefore, we must have a correct understanding and assessment of blue light, and don't exaggerate its harm!
How to properly avoid blue light hazards?
Of course, although the harmfulness of blue light cannot be overstated, if you are exposed to harmful blue light for a long time, you must take precautions, such as:
First, blue light protection. Many anti-blue glasses on the market can play a role in blocking blue light, so we'd better buy them through regular channels. But it needs to be emphasized that although blue light glasses can block blue light, this does not mean that you can freely "roam" in the world of electronic products after wearing them because blue light glasses cannot prevent myopia and relieve fatigue! In addition, it is undesirable to block blue light too much; otherwise it will easily cause color cast, aggravate visual fatigue, and also be harmful to health.
Second, use the lights correctly. LED lights that have passed the national quality inspection should be used. When using, avoid direct eyes to the LED light source. At the same time, pay attention to lower the lamp cover to achieve the purpose of blocking the light source.
Third, develop good eye habits. Control the time you spend playing with your mobile phone and computer. After staring at the screen for an hour, you have to look at the scenery. It is recommended to take part in outdoor activities and avoid using digital products in the dark.
There is still controversy about the "harm of blue light" in the medical field, but medical research in this field of blue light will definitely be more in-depth and comprehensive in the future. At present, what we ordinary people can do is to avoid risk reduction in advance, reduce the time of exposure to blue light at night, reduce dependence on electronic products, and work and rest rationally.
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