Goode is writing about some of the surprising causes of overeating and obesity. You also could consider writing about the causes of a current social problem. Think of topics you may already know something about (even though you may also want to do some research on the topic). Consider, for example, why a school, local business, or team with which you are familiar is or is not successful; why there is an epidemic of bullying in the schools; or why students choose to go to college despite the high cost of tuition and the uncertainty of getting a job.