... Modification of Plant Metabolism for Human Health Ilan LevinAbstract Plants constitute a major component of our diet, providing pigments andadditional phytonutrients that are thought to be essential for ... essential for maintenance of human health and are therefore also referred to as functional metabolites. Several fruit andvegetable species already contain high levels of several of these ingredients, ... flavonoids impart much of the color and flavor of fruits, vegetables,nuts, and seeds, they form an integral part of the human diet (Parr and Bolwell,2000). Rich dietary sources of flavonoids include...