There is currently a growing body of evidence that supplementing the human diet with natural products is of major benefit for human health and well-being. Nowadays, the use of complementary or alternative medicine, functional food and especially the consumption of natural products, has been increasing rapidly world-wide, mostly because of their supposed less frequent side effects. Both in conventional and traditional medicines, food and natural products continue to provide valuable therapeutic agents. The issues regarding the efficacy and safety of currently available modern medicine agents have prompted the search for safer and more effective alternatives. This book contains a comprehensive collection of the beneficial features of fruits, vegetables, nuts and medicinal plants and herbs, against various diseases and how they should be utilised to obtain all their qualities and benefits.