Harvard University researchers have uncovered a mechanism through which caloric restriction and exercise delay some of the debilitating effects of aging by rejuvenating connections between nerves and the muscles that they control. The research, conducted in the labs of Joshua Sanes and Jeff Lichtman and described this week in the journal Proceedings of the National Academy of Sciences, begins to explain prior findings that exercise and restricted-calorie diets help to stave off the mental and physical degeneration of aging... 
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