why are working class Americans more likely to experience morbid obesity than upper middle class Americans?-(SOLVED)

why are working class Americans more likely to experience morbid obesity than upper middle class Americans? Why are African Americans more likely to have cardiovascular diseases? Why are Black women three to four times more likely to die from pregnancy-related causes than their white counterparts? Why is the mental illness rate disproportionately higher in the Asian American community in the United States?

While some of the factors that may explain the health issues may be due to biological / genetic factors, the point of this assignment is to examine the sociological factors that may contribute to these differences. You should do some Internet research to examine this issue.