Your immune system, which protects you from disease, likes you to be dirty and happy (or does it)? A new study shows that men who are hostile and prone to frequent intense feelings of anger and depression could be harming their immune systems, making them more vulnerable to health problems like heart disease.

Researcher Steven Boyle studied over 300 male Vietnam veterans who were part of a larger 20-year study on the effects of Agent Orange. For the study, besides physical tests, the vets underwent a standard psychological test used to assess hostility, depression and anger.
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