Identify the Main Point or Issue in the Following Passage

Essay

Identify the main point or issue in the following passage, and decide whether the rest of the passage offers reasons for the main point (such as, whether the passage contains an argument), whether it illustrates (provides examples for) the main point, whether it explains the point, is irrelevant to the point, and so on.
"[F]ast food and national restaurant chains… that serve it have long been the object of criticism by nutritionists and dietitians. Despite the attention, however, fast-food companies, most of them publicly owned and sprinkled into the stock portfolios of many striving Americans…, have grown more aggressive in their targeting of poor inner-city communities. One of every four hamburgers sold by the good folks at McDonald's, for example, is now purchased by inner-city consumers who, disproportionately, are young black men."
-Greg Critser, "Let Them Eat Fat," in Harper's Magazine