Neuroscientist Warns Common Household Item Poses Public Health Risk

Professor Glen Jeffery of University College London has raised concerns about the widespread use of LED lighting, describing it as a potential public health emergency on par with asbestos.

Jeffery asserts that LED lights, ubiquitous in homes, offices, and public spaces, may contribute to health issues such as diabetes and other metabolic disorders. "LED lighting is damaging mitochondria and therefore there is no question you’re damaging systemic health," Jeffery stated in an interview. "This is a clear and present public health emergency and we need to take action."

Mitochondria, which are crucial for energy production and metabolism regulation, have been the subject of research. Studies suggest that daily exposure to short-wavelength blue light from LEDs can reduce mitochondrial activity. One study involving mice indicated that such exposure reduced mitochondrial activity by approximately 50%, while another found alterations in activity, metabolism, and liver function in mice exposed to blue-enriched LED lighting. Mitochondrial dysfunction has been linked to aging and various diseases.

Jeffery believes these effects stem from changes in bodily signaling. He explained that mitochondria send signals throughout the body via blood, influencing "cytokine profiles" and the collective communication between mitochondria within the body.

However, not all experts share these concerns. The European Commission’s Scientific Committee on Health, Environmental and Emerging Risks (SCHEER) concluded that "there is no evidence of direct adverse health effects from LEDs in normal use by the general healthy population." SCHEER did note that LED lights can cause temporary discomfort and may affect the sleep-wake cycle, but emphasized that "more research is needed to ascertain the specific impact of LED lights on the sleep/wake cycle, and also to determine if disturbances to the circadian system lead to adverse health effects."

Jeffery and his colleague Dr. Edward Barrett conducted a study comparing the effects of broader-spectrum tungsten lighting and standard LED lighting on adults over two weeks. The group exposed to broader-spectrum light showed improvements in color-contrast vision, while the LED group did not. Further research by Jeffery indicated that even a brief three-minute exposure to red light could enhance color-contrast vision. His work also suggests that long-wavelength red and near-infrared light can penetrate deeply into the human body.

To mitigate potential negative effects of LED lighting, Jeffery suggests ensuring the presence of fuller-spectrum light by using incandescent or halogen bulbs alongside LEDs. He also recommends regular exposure to sunlight, particularly in the morning and evening, as another source of broad-spectrum light.