Morgan talks to some health experts about the obesity epidemic in America and how fast food restaurants are a contributor to it. Lisa Young, a professor at New York University, illustrates how fast food companies have changed their portion sizes over time to make excessive amounts of food the norm.

Miley's date accompanies a stranger's child on a fair ride because the child's mother is too tall.

This clip contrasts the differences in how people used to get their food and now. The world changed from farmers to companies. It highlights how little we know about the food we purchase from the grocery store.

In this clip, John gives advantages and disadvantages to humans transitioning to agriculture.

Dr. Nick shows Homer and Bart how to test whether a food item has a lot of fat in it. He also shows his version of the food pyramid.