In the year 1900, the life expectancy of a man in the United States was 48 years and that of a U.S. woman was 51 years. Since then the life expectancies of U.S. men and women have increased to 76 and 81, respectively. Nonetheless, the steady increase in lifespan has not translated into an increase in health span. In fact, while morbidity and mortality caused by communicable diseases have decreased exponentially, the incidence of noncommunicable chronic disease continues to rise, escalating the n…