Artificial Nightlight Exposure Raises Heart Disease Risk Across Multiple Studies

Recent studies reveal that exposure to artificial light at night disrupts the body's natural circadian rhythms, significantly increasing the risk of metabolic and cardiovascular diseases. Research from Bochum highlights how artificial light interferes with melatonin production and internal clocks, potentially leading to fatty liver disease. Large-scale analyses from the UK Biobank and Massachusetts General Hospital link nighttime light exposure to elevated risks of heart failure, stroke, and arterial inflammation, with some studies reporting up to a 56% increase in heart failure risk and a 35% rise in heart disease over five years. The biological mechanism involves light-induced brain stress triggering immune responses that inflame blood vessels, contributing to arterial hardening. Experts recommend reducing screen time before bed, using dim or warm bedroom lighting, and considering urban lighting reforms as practical interventions. These findings suggest that light hygiene should be incorporated into public health strategies for preventing cardiovascular and metabolic disorders.