On many occasions in my adult life, I have made New Year’s resolutions to become fitter.  As the days of the old year gradually dwindled and my girth gradually expanded, I would commit myself to exercise more and eat less.  However, experience has taught me that both of these noble aspirations must be approached with moderation.  Any attempt to starve myself while running more miles leads inevitably to physical slowdown or breakdown.  Moreover, if I simply refuse to eat more, the exercise comes to a screeching halt.