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7 Thoughts That Are Bad For You

Our personalities do more for us than determine our social circles. Temperament can impact a person's physical health.

"The idea that behavior or personality traits can influence health is one that's been around for a long time. We're just now getting a handle on to what extent they do," said Stephen Boyle of Duke University Medical Center in North Carolina.

From those with a chill demeanor to the completely frazzled types, mental factors are ultimately tied to physical health. And while a highly neurotic person might deteriorate more quickly than others, not every character trait will kill you. Some might even boost lifetimes.

-- Jeanna Bryner