In the 1990 US Census, the population was approximately 260,000,000.  In the 2000 US Census, the population was approximately 285,000,000.  During the same time period, the total fertility rate was approximately 2.1 children.  At this total fertility rate, what would you expect the rate of population growth to be?  If this were true, what accounts for the 25,000,000 increase in the population?  What effect might obesity and diabetes have on current life expectancy?