This story is pretty crazy.  Retired Iowa science teacher John Cisna claims he successfully lost 60 pounds eating McDonald’s exclusively for an entire semester.  He challenged his students to construct a strict low-calorie diet that he had to stick to, eating nothing but options from McDonald’s menu.

How’d he pull this off?  Why would he want to try such a risky diet in the first place?  Click on Morning Bull’s convo with John Cisna below to find out!