The departed manes have Svadha for their. The animals have herbs and plants for their food. The wise have said that rice, etc., form the food of human beings.
पितॄणां च स्वधा प्रोक्ता पशूनां चापि वीरुधः॥ अन्नमेव मनुष्याणां प्राणानाहुर्मनीषिणः।