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A new study has found that individuals who are confrontational and aggressive put themselves at a higher risk of having heart attack or a stroke.

The researchers with the U.S. National Institute on Aging examined 5,614 Italians in four villages, and found that those who scored high for antagonistic traits in a standard personality test had greater thickening of the neck arteries compared with people who were more agreeable.

The study found that 10% of the people who were considered the most antagonistic had about a 40% higher risk for thicker arteries. Thickness of neck artery walls is a known risk factor for heart attack and stroke.

via WebMD