Fasting is honoured by God
Fasting is a submission to God and while Jesus was led to the wilderness in Luke 4, (or Matthew 4) we see after constant, consistent rejection of the Devil, Jesus is ministered to, returning in the Power of the Holy Spirit. Even before this occurred, Jesus was given the strength by the New Spirit which resided in him to speak back life to the Devil as he became tempted. God honoured Jesus and the fasting and while he was weak God made him strong. Paul stated that God was his strength in times of weakness (2 Corinthians 12:9).
Faith is unto death and beyond! Esther in Esther 4:16 asked those in Shushan to proclaim a fast to God, so that when she entered the king’s presence, which was not lawful unless sanctioned, she would find favour. She said if she dies she dies! She was of course accepted and her fast here was honoured by God.