A peek at a best-seller list or a trip to the local bookstore reveals a plethora of books on aging. Their prevalence reflects considerable interest in longevity and healthy aging during a unique time in our country’s history. The U.S. population is older than it has ever been. 

Hormonal changes associated with aging result in slower metabolism, loss of muscle mass, a propensity for weight gain, cognitive decline, and increased risk of diabetes, heart disease, and osteoporosis.