So What is Plan A?

Driving to the office today I heard a radio ad. It started something like, "You are not a celebrity, you are an ordinary person, try the diet Plan 'B'... I stopped listening closely immediately because I knew that Plan 'B' was not for me...but I generally listened because I wanted to know what Plan 'A' was but they didn't say where to get information on Plan 'A'.  Now I just don't know what to do.