While Americans expend fewer calories at work, they spend more time in cars -- almost twice as much as in the 1970s.

CNN: Why we're getting fatter -- and what to do about it

Pick any aspect of employment-related immigration and one will find regulations that compel companies to expend time and money under the notion that the number of jobs in America is fixed, work can be performed in only one geographic location and nearly all individuals in a given field are the same.

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As Americans spend more time in cars and behind desks--both of which are long-term trends--they expend fewer calories in their daily lives.

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