Every year, for one complete lunar month-the ninth month in the Islamic calendar, you as an adult Muslim are required to fast. From dawn to sunset in the month of Ramadan, you are required to refrain from all food and drink and sexual relations with your spouse.
If you are sick or on a journey you are allowed not to fast but you must make up for it by fasting the same number of days missed during Ramadan.
Why should I fast?
The main purpose of fasting is described in the Quran as "so that you may attain Taqwa or God-consciousness." Fasting is thus yet another instrument for bringing us closer to our natural state, our state of Fitrah and for cleansing this state from the dross of any disobedience and corruption.