अहं वैश्वानरो भूत्वा प्राणिनां देहमाश्रितः।प्राणापानसमायुक्तः पचाम्यन्नं चतुर्विधम्
ahaṁ vaiśhvānaro bhūtvā prāṇināṁ deham āśhritaḥ prāṇāpāna-samāyuktaḥ pachāmy annaṁ chatur-vidham
Becoming the fire of life, I pass into their bodies and, uniting with the vital streams of Prāṇa and Apāna, I digest the various kinds of food.
Translated by Shri Purohit Swami
Having become the fire Vaisvanara, I abide in the bodies of living beings and, associated with the Prana and the Apana, digest the fourfold food.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
aham—I; vaiśhvānaraḥ—fire of digestion; bhūtvā—becoming; prāṇinām—of all living beings; deham—the body; āśhritaḥ—situated; prāṇa-apāna—outgoing and incoming breath; samāyuktaḥ—keeping in balance; pachāmi—I digest; annam—foods; chatuḥ-vidham—the four kinds