One scene that stood out to me is when Morgan Spurlock interviewed Bruce Howlett. Bruce said that he drinks two gallons of soda a day, and he actually lost his eyesight for a period of time. He ended up in the hospital for surgery, however once he eliminated sugars he regained his eyesight.
This is very disturbing and actually scary because it shows how severe the consequences are of eating fast food or drinking too much soda. One would think that after a certain point, Americans will do something about it and search for help. Obviously for some people, food is more important than their health.