Interest has been revived in fasting over the last few years.  New books are being written on it all the time now.  If you type “Daniel fast” in your search engine, it will take you to a lot of  biblical background information, as well as recipes if you are doing an extended fast, such as the 21 or 40 day Daniel fast.  I highly recommend it.  Fasting

•  is a way of humbling ourselves and drawing near to God
• teaches and requires self-control (a fruit of the Spirit)
  
• is a vehicle for repentance – individual, as well as corporate

If you are interested in further study of the subject, just go to any Christian bookstore, or christianbook.com online, and you will find a number of books that discuss fasting itself, as well as recipe and menu books.  It is not for the faint of heart, but follows the blueprint for renewal given in 2 Chronicles 7:14, “Then if my people who are called by my name will humble themselves and pray and seek my face and turn from their wicked ways, I will hear from heaven and will forgive their sins and restore their land.”