The Hidden Cost of Blue Light: Multiorgan Pathology Induced by LED Exposure in Mice
Life evolved under broad-spectrum sunlight (300-3500 nm), but most modern light-emitting diodes (LEDs) emit within a restricted visible range (350-650 nm) leaving lighting environments that are short-wavelength dominant. We ask if chronic 450nm exposure dominant in LEDs alters metabolism and organ integrity in ageing mice environmentally exposed at 13 mW/cm{superscript 2} for 5 h/day over 40…
For decades, life on Earth has thrived under the expansive spectrum of sunlight, but contemporary lighting technologies like LED bulbs cast a narrower, short-wavelength light. Researchers sought to determine if prolonged exposure to the dominant 450nm light emitted by these LEDs could impact the health of aging mice, under conditions comparable to natural light exposure.
After forty weeks of consistent 450nm LED illumination at a safe 13 mW/cm² level, daily exposure sessions lasting five hours, the rodents displayed a surprising pattern of increasing weight despite consuming less food. Their glucose tolerance and insulin sensitivity also began to deteriorate over time. The white adipose tissue in their bodies expanded, while the brown adipose tissue and levels of UCP1 remained unchanged.
Organs, including the heart, liver, kidneys, and testes, exhibited a 10% decrease in relative weight. Upon closer examination, histopathological analysis revealed fat deposits, liver cell damage, renal tubular injury, steatosis, and abnormal testicular structures. These observations suggest that chronic exposure to 450nm light from LED sources can lead to metabolic disruptions and multiorgan pathology in mice.
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