Viruddhashara is a unique concept in Ayurveda referring to the consumption of incompatible foods. Eating incompatible foods can cause health issues similar to poison by disrupting the body's equilibrium. Some examples of incompatible food combinations mentioned are milk with sour substances, fish with milk, and honey processed with heat. Consuming incompatible foods can lead to diseases like vomiting, inflammation, and madness. The treatment involves cessation of the incompatible foods and use of opposing foods and herbs to restore balance.