"Fasting" is a conscious, purposeful restriction, cessation of access to spiritual "Food" of various false beliefs, pernicious ideologies, false teachings, elimination of sinful outlook, thoughts, desires in one's consciousness and way of life.
"Fasting" is a conscious, purposeful application, use by a person in his worldview and actions of the true "Food" - only the true Word of God's Covenants, Commandments to achieve a pious, righteous way of life.