What's the theme of chapter 5 in omnivores dilemma

In chapter 5 it is shown how the food companies are using chemical processes to divide corn into parts, and in this way, they are producing corn syrup.

Explanation:

Those products are entering supermarkets. Food companies are working hard to come up with new ideas to use corn so that the whole amount could be eaten.

In the past, corn was clean food that was used like that. However, today, it can be cut to elements and combined in different ways, like corn syrup. It shows that technology and man had changed the way people eat today.