This new, enlarged edition of the classic book contains over 400 references to scientific literature that contributed to the formulation of Dr. Howell's revolutionary Food Enzyme Concept. Minor corrections and modifications have been made for greater clarity, and a new glossary of scientific terms has been incorporated to facilitate understanding of the contents. Included in the book is an interview by Viktoras Kulvinskas with Dr. Edward Howell. An extensive new foreword by Viktoras Kulvinskas has been added to this revised and enlarged 3rd edition, as well as a new research appendix at the end. The Foreword adds a very substantial body of recent and updated research to support the food enzyme concept of Dr. Howell and underline the importance of food enzymes.