That is why the pure devotees only eat Krishna prasada and do not eat "food".
In ISKCON it was always taught that devotees don't eat "food", but devotees honor prasadam that is the remnants of offerings to the spiritual master and the Lord Krishna Caitanya.

When a devotee honors prasadam that is the remnants of offerings to Guru and Gauranga, then that is actually a completely spiritual activity and should never be equated with when unoffered food is eaten for the pleasure of the senses.

In bhakti-yoga, honoring prasadam simply increases one's love of Krishna and cannot be compared to the eating of ordinary food that devotees like to call "bhoga"(unoffered food).

Anyone who has actually tasted or subsisted off of Krishna-prasadam knows the difference between honoring prasadam and eating unoffered food.

Devotees of the level of Srila Prabhupada actually taste transcendental bliss in the act of honoring prasadam and experiencing the spiritual nature of foods that have first been offered to Krishna according to the guidelines layed down by Guru and Gauranga.
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