Every creature wants diet for survival in this world. Specific diet is suitable for specific creature and everyone has to follow the nature's rule. But sometimes it is taken for granted only for taste which is injurious to health. In ancient era it has been described in Ayurveda that, there are some dietary combinations which are really injurious to health. So with the help of study of Virudha Aahar, the first aim of Ayurveda that is prevention, can be achieved. The knowledge of Virudha Aahara may prevent certain diseases. In Ayurved, Acharya Charak also stated that the diet is the life of an individual's only if it is taken with Yukti. The Yuktiyukta diet produce effects like Rasayana but without Yukti it can be like Visha (poison) which may be leading to Prannasha (death). The substances which are contrary to dehadhatus (seven fundamental elements in the body) behave with Virudha (antagonism). This antagonism may be in terms of properties, combination, processing, place, time and dose, etc. or natural composition.
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