Background& Objectives: Aahar (food) is life of human being. Aahar (food), Nidra(sleep), Brahmcharya(celibacy) are the three pillars of human body. Viruddha aahar is very important issue stated by Ayurvedic literature. In modern era incompatibility food had explained. Objectives: 1. to study the concept of viruddha aahar. 2. To study the incompatibility of food. Material & Methodology: Literary study of viruddha aahar was done. Literary study of incompatibility of food was done. Discussion: Description of aahar, viruddha aahar, its type was done. Conceptual study . Incompatibility of food was done. Conclusion: it is manifested that Viruddha Aahara is an important aspect of present era having improper diet.