Doctor, what can I do myself? This frequently asked question shows that the willingness to change lifestyle habits is high after a cancer diagnosis. Equally high are the hopes raised by uncritical reporting or dubious advertising. Dr. Konopka has been advising patients on cancer for many years. In this book, his experiences are summarized. He informs about the effects of so-called complementary therapies and provides practical advice on improving quality of life and immune defense, dietary changes, and protective substances from food.