The document discusses breakfast cereals, including the 10 most popular brands in the United States. It notes that nearly half of Americans eat cereal each day and over 2.7 billion boxes are sold annually. The text also addresses nutrition facts about the top cereals, mentioning that only one of the top 10 is generally considered healthy while three are considered the unhealthiest options. It concludes by noting the cereal industry competition between big brands like Kellogg's, General Mills, and Post.