"Fasting is a medicine. But medicine, as beneficial as it is, becomes useless because of the inexperience of the user."
St. John Chrysostom, a holy bishop of the 4th century, lays out his thoughts on the “correct” way to fast in several of his homilies. He sees fasting as beneficial, but only if it is done with God’s grace.
Here is his advice on how to approach fasting in a Christian way.