Don’t work too hard. It may actually be deadly.

A new British study has found that employees who work 10 hours a day are more likely to end up with heart problems than those who work fewer hours.

“The researchers followed more than 6,000 civil servants in the U.K. between 1991 and 2004 for an average of 11 years per person… By the end of the study, people who had worked 10-hour days were 60 percent more likely to have heart problems than people who worked seven-hour days,” ABC News reports.

One of the paper’s authors speculated that those who work longer hours deal with more stress, which “adversely affects metabolic processes” and can be hard on the heart.

Moral of the story: Stick to the 9-5 work day if you can, and if you do work long hours, get regular check-ups and be on the lookout for any rise in your blood pressure or pain in your chest.

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