“And when you fast….” Jesus expects His disciples to fast and pray. The question is not, “Should I fast?” Instead, we should ask, “When and how do I fast?”
“But as for you, when you fast, anoint your head and wash your face,so that your fasting will not be noticed by people but by your Father who is in secret; and your Father who sees what is done in secret will reward you” (Matthew 6:17-18)