Now-a-days non-communicable diseases and metabolic disorders have become the major concern of health care providers and researchers. The major causes of these health problems are change in lifestyle and food behavior. Ayurveda has given great consideration to diet, dietary methods along with daily and seasonal regimens and code of conduct in health and disease. Acharya Charaka has quoted that human body and disease both are the product of nutrition. The state of health depends on diet and dietetic, faulty intake of diet results in diseased state. The person who wants to be free from different diseases should eat Hitakar Aahar (suitable diet) in adequate amount on appropriate time as per the status of digestive fire. Ayurveda has given an extensive description about Diet and Dietetics under the preview of Ashtha Aahar Vidhi Visheshayatana (eight specific factors related to method of food cooking, processing, food combinations and it’s intake) and Dwadasha Pravicharana (twelve rules related to method of intake of food), Viruddha Aahar (incompatible diet), Pathya (suitable), Apathya (unsuitable) diet.<p>All the ancient literatures related to different cultures including Ayurveda have focused on diet in maintenance of health and management of diseases. But the available dietetics literatures have not acknowledged the contribution of Ayurveda scholars. The dietetic concepts described in Ayurveda, may contribute a lot in maintenance of health and management of life style disorder. The aim of writing this article is to highlight the hidden concept of the diet and dietetics to the researchers in the field of dietetics and medicine.</p>