premise: The article also mentions the greater prevalence of obesity among two minority populations, African-Americans and Hispanic/Latino, but does not consider in its analysis of the increase in obesity the increase of these these populations as a proportion of the United States population.  African-Americans and Hispanic/Latinos have a higher rates of obesity than White Americans, while Asian-Americans have a relatively low rate of obesity. Despite only representing one third of the U.S. population, African-Americans and Hispanic/Latinos represent about one half of the population growth.
hypothesis: African-Americans are a minority in the U.S.