TAITTIRĪYA UPANISHAD · 3.7

अन्नं न निन्द्यात् । तद्व्रतम् । प्राणो वा अन्नम् ।
शरीरमन्नादम् । प्राणे शरीरं प्रतिष्ठितम् ।
शरीरे प्राणः प्रतिष्ठितः । तदेतदन्नमन्ने प्रतिष्ठितम् ।
स य एतदन्नमन्ने प्रतिष्ठितं वेद प्रतितिष्ठति ।
अन्नवानन्नादो भवति । महान्भवति प्रजया
पशुभिर्ब्रह्मवर्चसेन । महान् कीर्त्या ।

annaṃ na nindyāt । tadvratam । prāṇo vā annam ।
śarīramannādam । prāṇe śarīraṃ pratiṣṭhitam ।
śarīre prāṇaḥ pratiṣṭhitaḥ । tadetadannamanne pratiṣṭhitam ।
sa ya etadannamanne pratiṣṭhitaṃ veda pratitiṣṭhati ।
annavānannādo bhavati । mahānbhavati prajayā
paśubhirbrahmavarcasena । mahān kīrtyā ।

Thou shalt not blame food; for that is thy commandment unto labour. Verily Prana also is food, and the body is the eater. The body is established upon Prana and Prana is established upon the body. Therefore food here is established upon food. He who knoweth this food that is established upon food, getteth his firm base, he becometh the master of food and its eater, great in progeny, great in cattle, great in the radiance of holiness, great in glory.

Sri Aurobindo · CWSA 18, p. 228