This book has consistently been used by students studying the first course in Food Science and Nutrition. In several universities, diet therapy topics have been added in the curricula of this course. Therefore, diet therapy has been added in this revision, with a hope of meeting the changing needs of the readers in this area. The revised edition incorporates topics which are related to useful subjects, like nursing, education, art, social sciences, home science, medical and paramedical sciences, agriculture, community health, environmental health and paediatrics etc.