How does fasting from meat change anything?

Today's Readings: Isaiah 58:1-9 Ps 51:3-6, 18-19 Matthew 9:14-15 www.usccb.org/bible/readings/021618.cfm USCCB Podcast of the Readings: ccc.usccb.org/cccradio/NABPodcasts/18_02_16.mp3 A reading from the Holy Gospel according to Matthew. The disciples of John approached Jesus and said, "Why do we and the Pharisees fast ...