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. ----------------------------------------------------------------- The FAQ for Evolutionary Fitness is at http://www.evfit.com/faq.htm To unsubscribe from the list send an e-mail to [log in to unmask] with the words SIGNOFF EVOLUTIONARY-FITNESS in the _body_ of the e-mail.