Hormonal impact of blue light
Our circadian rhythm is regulated by light. Because the proportion of blue light follows a distinct distribution during the day, is has made sense for millions of years to use it for adjusting the “inner clock”. The cells in the ganglion layer, which maintain a direct connection to the inter brain and help control the circadian rhythm, are most sensitive to light with wavelengths around 460nm (=blue light).
Blue light sets the body to “daytime mode”, suppressing the production of melatonin, the so-called sleeping hormone, and increasing the production off different stress hormones such as cortisol.
While this clearly makes sense as an adaption to the actual time of day, excess exposure to blue light, especially in the evening and night, can cause serious health problems.
A lack of melatonin not only leads to poor sleep, but also plays a role in the development of hormone-related cancers, such as breast and prostate cancer, and is a risk factor for so-called “lifestyle diseases” (diabetes, cardiovascular diseases, high blood pressure,…).
What you can do:
The hormonal impact of blue light is especially disruptive to the circadian rhythm in the afternoon and evening. If you are working on a flat screen (or watching TV) in the evening, the ideal protection for your eyes and your hormone system is the bluelightprotect filter AMBER PRO.
Eliminate all LED and energy saving lights from your sleeoing area, and sleep in as dark an environment as possible. Street lights increasingly add to the blue light burden in our light environment, as LED becomes more popular. Use heavy curtains or window shutters whenever possible.
Natural daylight is the best we can give to our bodies for optimum health, especially in regard to our hormonal balance. Make sure spend time outdoors every day. You might take the bike to go to work or spend your lunch break in the fresh air to make sure you get a good dose of natural daylight.