Night-shift workers may face an increased risk of cancer, say researchers.
The World Health Organization is to classify shift work as a “probable” carcinogen, suggesting it poses a similar risk to agents such as anabolic steroids, ultraviolet radiation and diesel engine exhaust.
The theory could have ramifications for millions of people, especially in the developed world, where one person in five works nights.
It would also mark an about-turn for the scientific community, which has previously discarded such notions.
