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Published 10:10 20 Aug 2015 BST
Updated 14:57 25 Jan 2017 GMT

Researchers at University College London reviewed over 40 studies relating to hundreds of thousands of adults across Europe, Australia and the U.S.
Even when controlling for factors like age, sex and health issues like smoking, the results held steady.
Just a small amount of overtime is enough to see increased risk - with workers who put in 41 to 48 hours seeing a 10 per cent increased risk of stroke. This soared to a 27 per cent increased risk for employees who worked between 49 and 54 hours per week.Explore more on these topics: