Endocrinology is the branch of medicine that deals with the endocrine system. This system consists of various glands present in all parts of the body. It focuses on all the functions and behavioral activities performed by hormones such as sleep digestion, mood, excretion, stress, reproduction, lactation, movement, etc. Metabolism is the set of life-sustaining activities occurring within the cells of the living organisms. It is a sub-field of endocrinology. This book includes some of the vital pieces of work being conducted across the world, on various topics related to endocrinology and metabolism. It aims to shed light on some of the unexplored aspects related to these fields. Those in search of information to further their knowledge will be greatly assisted by it. This text will serve as a valuable source of reference for endocrinologists, academicians and students.