Our church, Westchester Chapel, has been called to fast on Thursdays as we seek the Lord for spiritual, numerical and financial growth for the church. Our pattern is to break our fast together at Thirst.
A new believer asked why and how we should fast, which are excellent questions!
I found a great article by the late Dr. Bill Bright, who founded Campus Crusade for Christ: Your Personal Guide to Fasting and Prayer. He provides insights into the Biblical call to fasting, types of people who should not fast, and nutritional considerations.
I also highly recommend Celebration of Discipline by Richard Foster (who used to pastor the church I attended in college). He deals with the full spectrum of spiritual disciplines, and has an excellent chapter dedicated to fasting.