The researchers tested whether exposure to light, day and night, was linked to mortality risk.
Daniel P. Windred of the Flinders University (Australia) and colleagues analyzed data on 88,905 participants in the UK Biobankaged 62 (40 to 69 years) at the start of the study, who wore light sensors for a week and were then followed for an average of 8 years. During follow-up, 3,750 mortalities with a known cause were recorded.
People exposed to high levels of light at night had a 21-34% increased risk of death, while those exposed to high levels of daylight had a 17-34% decreased risk of death.
« Exposure to brighter nights and darker days can disrupt our circadian rhythms, a disruption that is known to lead to a variety of health problems, including diabetes, obesity, cardiovascular disease and mental health problems. thus increasing the risk of death
“, explains co-author Sean Cain.
Exposure to light at night disrupts circadian rhythms by shifting the timing (phase shift) and weakening the signal from the central circadian “pacemaker” that orchestrates circadian rhythms throughout the body, says Andrew JK Phillips, also a co-author.
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Psychomedia avec sources : Flinders University, PNAS.
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