In this material world maha-prasada is the only food, which is fit to be accepted, because it provokes spiritual consciousness and dissolves one’s materialistic nature.  Therefore, Sri Isopanisad (1) says: 

 “Everything animate and inanimate within the universe, is situated in Krishna, and is pervaded by Him.  Therefore, in a detached mood, one should accept only what is necessary for one’s maintenance, considering all things to be the remnants of Krishna.  One should not be attached to another’s wealth, considering himself to be the enjoyer.” 

Whatever exists within the universe is connected to Bhagavan’s potency?  One will give up the worldly-minded spirit of enjoyment, if he considers everything to be related to Bhagavan’s spiritual potency.   

An introspective jiva will not be degraded, if he accepts only those worldly things that are necessary for the maintenance of his body, considering them the remnants of Bhagavan; on the contrary, his inclination toward spiritual consciousness will be aroused.   

The remnants of food and other articles offered to Bhagavan are known as maha-prasada.