ABSTRACT
Early in the history of civilization, humans in their quest for food must have attempted to eat a variety of plant and animal materials. Through trial and error, they discovered two classes of materials, that is “food” and “poison.” Residents of the Korean peninsula have subsisted upon a scanty food supply for 6 millennia. South Korea has a highly dense population, mountainous areas constitute two-thirds of the Korean peninsula, and the arable land is quite limited.
