Which of the following statements are the reasons of American people’s obesity？

A.American people think obesity is not harmful to health.

B.American low-income groups are not aware of the importance of healthy diet.

C.Working people are busy doing their jobs to support family， therefore they have little chance nor time to do regular physical exercise.

D.Products made of cheap corn are widely eaten by people in daily diet.

正确答案：American low-income groups are not aware of the importance of healthy diet.Working people are busy doing their jobs to support family， therefore they have little chance nor time to do regular physical exercise.Products made of cheap corn are widely eaten by people in daily diet.