Gerson Therapy is a controversial, holistic, nutrition-base therapy. Developed by German-born physician Dr. Max Gerson (1881-1959), believers in the therapy say it is effective for most chronic (degenerative) diseases. Unapproved for medical treatment of cancer in the United States due to the lack of medically agreed upon supporting scientific data, Gerson therapy has been a touchstone of medical nutrition politics for several generations in the US.