METABOLISM

Your metabolism is your basal metabolic rate (BMR).   Metabolism refers to the chemical processes in your body that build and destroy tissue.  It is estimated that a person's BMR drops about 2% per decade starting at age 20.  One way to slow this process is to add muscle to your body.  Muscle is active tissue requiring nourishment.  Fat is passive tissue that just sits there acting as a storage form of body energy.  Staying active will keep your metabolism fired up and using more calories.