Natural compounds and the quality of lifeThis paper presents in the first place a brief survey of the plant kingdom, which is the most important source of natural compounds. By some examples like fish-and arrow-poisons for obtaining food, chewingsticks for oral hygiene and stimulating narcotic plants like kava and the fly-ageric, the importance of natural compounds for the quality of life is demonstrated. A model for the relationship between food, drugs and stimulants and narcotic plants is given. Finally the importance of ethno-pharmaceutical research is stressed and a bibliography for this interdisciplinary field of science is given.