Jnana is “book knowledge” or “theory” because it entails the renunciation of all work, the suppression of the senses, and the rejection of the world as false. Vijnana is realized knowledge because it does not come about by mental speculation and the cessation of actions but rather by engagement in active devotional service.
Krishna wants us to eat only food offered first in sacrifice to Him: “The devotees of the Lord are released from all sins because they eat food which is offered first for sacrifice. Others, who prepare food for personal sense enjoyment, verily eat only sin.”
