A recent study published in American Journal of Internal Medicine says that working for more than 11 hours a day increases the risk of heart disease by 67 percent, compared with working a standard 7 to 8 hours a day.
The study followed 7,100 British workers for 11 years. The researchers stressed that a question about the duration of work should be a regular part of history taking by the doctor.They recommended that people who work long hours, should be particularly careful in following healthy diets, exercising sufficiently and keeping their blood pressure, cholesterol levels, and blood (sugar) within healthy limits.
Cardiovascular diseases such as heart attacks and strokes are the world's largest killers, claiming around 17.1 million lives a year, according to the World Health Organization (WHO). So its very necessary to lead a healthy, stress & over work free life, to keep your heart & body in good state.
Here is the link to the original study.