Brahadyogi yagya valkya Smriti states Amraatam Kalpayitwa Ca Yadannam Samupagatam |
Pranagnihotravidhina Vidhina Bhojyam Tadwadaghapaham||
Meaning: Having food should be treated like a yaj a in which (holy) sacrifices are made in the sacred fire of prana (vital, spiritual energy). Such a food becomes a source of elimination of all sickness and weakness of the body and mind .