I found a great article supporting something Art Devany said years ago.  He
wrote that a "high energy flux" is key to health.  Basically, high energy
flux is both expending a large number of calories each day and consuming a
large number of calories each day.  The link to the article:

http://thefactsaboutfitness.com/research/age.htm

The article also talks about the decline in metabolism with age is
apparently related to energy flux, not necessarily muscle mass.

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