Millions of complex chemical reactions are going on in the human body at any given time. The balance of the endocrine system, which controls hormone levels, is one example; how the brain processes information from nerves and how signals are relayed from place to place is another. By studying and understanding these highly complex reactions, medical biochemists have found ways to better fight infection and disease on the molecular level. Much of the field is dedicated to research. The time experts spend studying samples and creating reactions has led to a number of breakthroughs in heath care and disease management, and it seems likely that this field will be very much “in demand” for years to come.