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Exposure to blue light would shorten life expectancy.

According to a study, prolonged exposure to blue light from screens would reduce life expectancy.

Excessive blue light exposure

Exposure to blue light from the screens is hazardous. This is the conclusion of a new study on fruit flies conducted by Oregon State University and published on October 17. With the multiplication of screens, humans are increasingly exposed to large amounts of light in the blue part of the spectrum. This light is mainly in the LEDs of the screens.

The study, published in the journal Nature’s Aging and Mechanism of Disease, analysed the Drosophila fly’s reactions to exposure to blue light. Dozens of flies were therefore divided into different groups with different exposures to blue light.

Blue light damages nerve cells

The results show that flies exposed to alternating cycles of 12 hours of blue light and 12 hours of darkness had a much reduced life expectancy compared to flies kept in total darkness or in white light filtering the wavelengths of blue light.

The flies had also undergone accelerated aging. Damage was observed on the retinal cells. Researchers also reported neurodegeneration and impaired mobility. Blue light would damage nerve cells. The study also found that blue light increased stress in older flies. While LED technology has not been used long enough to know its effects on humans, this is the first time that exposure to blue light has been directly associated with a decrease in life expectancy.