In Ayurveda, Ahara (food) is not regarded merely as a means of survival but as a fundamental pillar of life, placed foremost among the Trayopastambha—food, sleep, and disciplined living.In the present era, increase in lifestyle disorders, metabolic diseases, and digestive problems. This is not due to lack of food but due to improper food choices, irregular eating habits, and neglect of the principles governing diet. Modern nutrition often focuses on calories and nutrients alone, whereas Ayurveda views food as a dynamic force that influences digestion (Agni), body tissues (Dhatu), mental health (Manas), and vitality (Ojas). This holistic understanding makes Ayurvedic dietetics very relevant even today.The book begins with the basic concepts of food and digestion, including the role of Agni and Avastha Paka, and gradually moves towards the practical rules of eating (Aharavidhividhanam). It discusses the eight important factors that influence the effect of food, along with guidelines related to quantity, timing, compatibility, and the eating environment. Special importance is given to Viruddha Ahara, which helps in understanding how improper food combinations contribute to disease.