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If you are cheerful, you feel good; if you are sad, you hurt all over. Ancient Jewish Saying.

Doctors have thought about the connection between our mental and physical health for centuries. Until the 1800s, most believed that emotions were linked to disease. And doctors advised patients to visit spas or seaside resorts when they were ill. Gradually, however, doctors focused more on other causes of illness, such as bacteria and toxins (a toxin is a natural kind of pois...