Enzymes are mainly manufactured by the body to maintain daily well being. A shortage of even one type of enzyme can dramatically affect health. Over time, the body's ability to supply enough enzymes to keep up with its own demands of defense and protection decreases.
Unnatural components of our environment's, such as pollution, food additives, and stress all negatively affect the makeup of our cells. When the body works harder, there is a corresponding increase in our need for health promoting enzymes.