Sawm or Fasting
Every year in the month of Ramada-n, all Muslims fast from dawn until sundown--abstaining from food, drink, and sexual relations with their spouses.
Those who are sick, elderly, or on a journey, and women who are menstruating, pregnant or nursing, are permitted to break the fast and make up an equal number of days later in the year if they are healthy and able. Children begin to fast (and to observe prayers) from puberty, although many start earlier.
Although fasting is beneficial to health, it is mainly a method of self-purification and self-restraint. By cutting oneself from worldly comforts, even for a short time, a fasting person focuses on his or her purpose in life by constantly being aware of the presence of God.
God states in the Qur'an:
"O you who believe! Fasting is prescribed for you as it was prescribed to those before you that you may learn self-restraint." (Qur'an 2:183)