To reply to a digest, insert the relevant message header; don't reply to the digest header ------------------------------------------------------------- From: Wally Day > >Foundational to the exercise is paleo nutrition with a bit of caloric > restriction compared to energy expenditure. > > I don't know why, but your comment about a "bit of caloric > resreiction" brought this thought on :) > > We are all, I'm sure, familiar with the experiments with > extending lifespan using caloric restriction. But, I wonder if it only applies > to intake, or does it also apply to outgo? In other words, would one > receive the same benefits keeping calories the same and increasing activity? > Or by slightly reducing caloric intake, and slightly increasing activity levels? > > I'm not just referring to staying "in shape", which of course > is a reward in itself. This issue has been addressed empirically in animal studies. I don't have the references at hand and don't have the time to find them just now, but the results of studies comparing calorie restriction against exercise (while keeping weight equal) show that CR extends life span but exercising to achieve the same level of leanness does not. So, it's the reduction of caloric intake that produces the extension of life span. There are a few studies, however, that suggest that moderate CR with exercise may achieve the same life extending effect as more severe CR, although this work has not been replicated to my knowledge. -Robert. ----------------------------------------------------------------- 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.