This article offers an analysis of two medical case histories presented by an Iranian allopathic physician to illustrate the power of diet in the management of disease. Uncovering underlying cultural assumptions about health and health maintenance strategies leads to the following insights: (1) Galenic medical ideas have not been replaced by allopathic theories in the world view of Iranian physicians; (2) allopathic medical treatment options (pharmaceuticals) are applied to indigenous disease categories; (3) there is deep-seated scepticism about etiologic theories of allopathic medicine and its ability to treat certain conditions; (4) the authority of allopathic medicine is not unquestioned in Iran.