Radio presenter Christin is the star of the popular programme "Lose those Pounds!" on Antenne Berlin. Every evening she devotes herself to the problems of mostly women, dispensing advice about the daily battle against putting on weight. The fans of the programme have no idea that Christin’s real name is Carla - and she is more than just a little chubby herself. Because ever since her boyfriend abandoned her two years ago for a playmate, she would far rather eat chocolate than kiss men. Naturally, the Board of Directors at Slim Line also have no idea about Christin's double life; the company is determined to launch a new advertising campaign for its slimming products, featuring the face of the famous radio presenter who is said to have ideal proportions. Christin alias Carla has no intention of exposing her double life in this way and rejects all offers. Which gives Tallman, the good-looking junior manager of Slim Line, a cunning idea…