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NancyLebovitz comments on Rational Health Optimization - Less Wrong
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Much of the social status boost to life expectancy might not be due to wealth.
The "'Hierarchy Effect,' ...states that being lower in the social hierarchy independently impacts health through increases in the release of stress hormones. This has been shown fairly well in animal studies where researchers monitor the levels of stress hormones in primates and have found that being nearer the top reduces the overall level of stress hormones"'
http://longevity.about.com/od/researchandmedicine/a/hierarchy.htm
With those studies, I wonder how much is a sort of abstract being lower in the hierarchy, or having to give out submission signals, and how much is objectively worse conditions-- fro example, greater risk of physical assault or (for humans) less access to sunlight.