Food is an important aspect of all life forms. Diet and Nutrition is a fantastic topic of research as well as a matter of curiosity to general public. Food as therapy to treat certain diseases is an old concept practiced since ancient times. There are certain diet patterns used by modern day doctors and dietitians to treat certain disorders of body and mind, to improve health and to increase fitness levels. This hand book describes the concepts of food, nutrition, diet, how to prescribe a diet, diet of children, patients, pregnant ladies, lactating mothers and elderly persons. It describes all the diets prescribed in a hospital setting by Doctors and dietitians in a comprehensive way. This book is intended to be a quick reference guide for therapeutic diets and medical nutrition.