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There's a lot of connection between the mind and body. When you think about it, this seems so common-sense that it's hard to believe many people don't believe it. There are a lot of studies out that show that stress lowers immune function - some of the mechanisms have to do with cortisol, a stress hormone that lowers immune function. Others have to do with dopamine and serotonin, or various inflammatory agents. Some of the illnesses are psychosomatic - not to say that they're not real, just that they're triggered more by psychological than biological mechanisms. Think about it - stress is basically a fight-or-flight reaction to a (usually) non-life-threatening event. So you're keeping yourself constantly in a state of arousal that was meant only for life-and-death situations. Can't be good for you.
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"If ten million people believe a foolish thing, it is still a foolish thing."
- Anatole France
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