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She is a passionate doctor: Marianne Koch was studying medicine when she was discovered for film in 1950. She enchanted her audience in numerous roles and quickly became a celebrated star. But the call of medicine was louder: exactly 50 years ago, she devoted herself again to her passion - and to this day, the internist cannot let go of the topic of health. In August, the author and 3nach9 presenter from the very beginning will celebrate her 90th birthday! How does this extraordinary woman manage to stay so fit? What is her secret? Maybe we'll be lucky and she'll tell us on 3nach9.