This page contains some articles that addresses various aspects of Ramadan and fasting. These could be good references for you if you are preparing to talk about fasting or want to do a study of fasting as a practice.
Fasting: Not Just About the Food
Ramadan – The scared month of fasting
Ramadan and the essence of its blessings
Fasting in Islam and other religions
Seeking spirituality through fasting
Spiritual Fitness 