Brahadyogi yagya valkya Smriti states

Brahadyogi yagya valkya Smriti states Amraatam Kalpayitwa Ca Yadannam Samupagatam |
 Pranagnihotravidhina Vidhina Bhojyam Tadwadaghapaham
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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 .

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