More Friel wisdom on aging athletes

I found this highly depressing summary in another Friel article on older athlete diets. This one ultrafit.com - I'll add links when I get my laptop online.

Joel writes: It's apparent that as we grow older muscle mass is lost. Although this loss is slowed somewhat by weight lifting and vigorous aerobic exercise, it still happens. Even athletes in their 60s typically demosntrate considerably less muscle than they had in their 40s.

Now there is research that shows why (1). Nitrogen, which is an essential component of muscle protein, is given up by the body at a faster rate than it can be taken in as we get older. This is due to a gradual change in kidney function that comes with aging producing an acidic state in the blood. Essentially, we are peeing off our muscles as we pass the half-century mark in life.
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