Krishna moves from the macrocosm (sun, moon, planets) to the absolute microcosm: your own stomach. He declares that He becomes the fire of digestion (vaiśvānaro) situated right inside the bodies of all living beings (prāṇināṁ deham āśritaḥ). By joining with the incoming and outgoing life airs/breaths (prāṇāpāna-samāyuktaḥ), He actively digests (pacāmy) the four kinds of foodstuff (annaṁ catur-vidham—foods that are swallowed, chewed, licked, and sucked).