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It's a commonplace observation that as you age you have to work harder to keep the pounds off and to stay fit. One major reason is the inescapable biological fact that metabolism slows as we age. Inescapable for now, at least, until medical technology finds some safe way to alter it.

Genetic research into aging is trying, in a way, to do just that. Several studies in the last two decades have pointed to hints about precisely what causes aging. If they get sufficient knowledge of the subject, there is some hope of altering the situation.

Until then, there are several things a sensible person can do to stay trim, flexible and within a healthy weight or body fat percentage range. At any age, diet and exercise are the twin partners required to achieve those goals.

For some, working out an hour per day every day - a five mile run, a long swim, hitting every station on the weight machine - is still feasible. Others will have to adjust their routine to what is realistic for their own circumstances. Don't ignore the signals that will help guide you to do that. Mild discomfort is to be expected, especially the day after a vigorous workout. Extreme pain is a sign something is wrong.

There are dietary changes that will be needed, too.

As we age there's a greater temptation to indulge in tasty, but high sugar, high fat foods. We see it as a reward for all the years of hard work and dietary discipline. Unfortunately, we pay a higher price later in life for those than we did in our 20s or 40s.