We regularly make decisions based on what we value. For example, fasting has become a new hot trend recently. Many people are now fasting for various health benefits. Biblical fasting has proven to be a lot more than a health trend, however.
In Matthew, Jesus extols the spiritual benefits of fasting. He also shows that prayer and fasting are linked. When you fast - or give up something that is important to you for a period of time - you should replace that with prayer and with seeking God.